How to Get a H1 in Leaving Cert Biology

A H1 is 90% or above, in Biology and in every other subject. What has changed is where those marks come from. Under the specification now in schools, Leaving Cert Biology is marked out of 500. The written paper carries 300 of them and a Biology in Practice Investigation carries the other 200. A H1 therefore means 450 marks, and 200 of them are settled before you walk into the exam hall.

Which version of the subject you are on

The cover of the Leaving Certificate Biology specification gives its start date as September 2025. Students who began fifth year that month are the first group assessed on it, in June 2027. The SEC lists Biology under Tranche 1 of the Senior Cycle Redevelopment programme, alongside Chemistry, Physics and Business.

The candidates who sat Biology in June 2026 began fifth year a year before the specification arrived. They were taught the older syllabus, and their papers ran to 400 marks over three hours, split into Sections A, B and C. That layout is gone, so a plan built around "answer four of the seven questions in Section C" no longer describes the exam ahead of you.

The written paper: 300 marks in two and a half hours

The SEC has published two Higher Level sample papers. Sample 1 runs to 2 hours 30 minutes and 300 marks, and its instructions on page 2 read:

There are seven questions on this examination paper. Each question carries 50 marks. Answer Question 1 and any five other questions.

So you answer six of the seven, and every one of them is worth the same. That is 50 marks per question and 150 minutes of writing, which comes to about 25 minutes each if you spread the time evenly.

Question 1 is compulsory. In Sample 1 its five parts run across the digestive system, a synapse, an osmosis investigation with a data table, blood glucose regulation, and the nephron. One question reaches into five areas of the course. Choice starts at question 2, so a topic you have dropped can still cost you inside question 1.

Two more instructions on that page name ways to lose marks:

You may lose marks if your solutions do not include relevant supporting work. You may lose marks if the appropriate units of measurement are not included, where relevant.

The investigation is 40% and it is due in February

The second component is the Biology in Practice Investigation. The SEC sample brief states it plainly on page 2:

The Biology in Practice Investigation is worth 200 marks, which is 40% of the overall marks for Leaving Certificate Biology. The remaining 300 marks (60%) are for the final written examination.

You submit a written report, capped at 1,500 words and 20 images. The 200 marks divide into four blocks of 50 (page 8 of the brief). The first covers your title, introduction, background research and referencing. The second covers experimental design, method, safety, fairness, accuracy and equipment. The third covers your primary data, how you present it, your analysis and your conclusions. The fourth is Scientific Literacy, which the brief describes as criteria that "are not distinct sections of your report, they should be evident throughout".

For the 2027 examination the completion date is Friday 26 February 2027, listed in the SEC's schedule of examination and completion dates for 2026/2027. Your teacher will give you the live brief; the SEC publishes those alongside the sample materials.

Two things about those 200 marks are unlike a written paper. They are settled by February of sixth year, months before the exam. The criteria they are marked against are published in advance, so you can read what earns them while you are still writing the report.

What the old papers are still worth

The syllabus content did not disappear when the structure changed. Cell biology, genetics, ecology and human physiology are all still on the course. The eleven Higher Level papers from 2015 to 2025 hold 175 real SEC questions on that content. Three habits those papers reward carry into the new assessment.

Exact terminology is the first. Counting only the instructions "what is meant by", "explain the term" and "distinguish between the terms", they appear 90 times across those 175 questions, and in every one of the eleven papers. The 2025 Section C paper opens question 12 with "Explain the term mutation" and question 15 with "Explain the following three ecological terms: Biosphere, Niche, Competition" (2025 Section C, pages 3 and 6).

Drawing is the second. The instructions "draw" and "sketch" appear 75 times across the same 175 questions, in 59 of them, and in every one of the eleven papers. The sample paper keeps the habit in a smaller form, asking you to draw an arrow on a synapse diagram and to write the letter F on a nephron diagram to mark where ultrafiltration happens.

Practical work is the third, and the new assessment puts more weight on it than the old papers did. On the old papers, Section B was the practicals section, with three questions of which you answered two, six marks for the theory in part (a) and 24 for the practical in part (b). Across the eleven papers there are 33 Section B questions, and in 30 of them part (b) asks about a laboratory activity or investigation carried out during the course. The other three hand you data from an experiment you did not run and ask you to interpret it. Both skills appear in the new assessment, one in the investigation and one in the data-analysis parts of the written paper.

Our post on whether Leaving Cert questions repeat has the strand-by-strand recurrence counts for those eleven papers, and the topic pages group the questions for you. Enzymes, metabolism and membrane transport is a useful place to start if your live brief touches bioprocessing, since the sample brief's topic is enzymes in industry. Scientific method and the study of life collects the experimental-design questions, and genetics, DNA and evolution covers the strand that has appeared in every paper since 2015.

Write the term the scheme asks for

Biology marking schemes award marks against listed key words, and the 2025 Higher Level scheme sets out how far a paraphrase gets you. From page 3 of the 2025 scheme:

The scheme contains key words, terms and phrases for which candidates may be awarded marks. This does not preclude synonyms or terms or phrases which convey the same meaning as the answer in the marking scheme. Although synonyms are generally acceptable, there may be instances where the scheme demands an exact scientific term or unequivocal response and will not accept alternatives.

Two things follow for how you learn a definition. Describing the idea in your own words is usually accepted, so understanding beats memorising a sentence. Naming a structure, a process or a molecule is where the scheme can insist on the exact word, so those are the ones to know precisely.

The same scheme also has a rule about adding a second term beside a correct one. Where the only acceptable answer is a specific word, the scheme marks the spot with an asterisk, and an incorrect addition can nullify the correct answer. So covering your bases by naming two candidates can cost you the mark you already had.

How the notation works, and how partial credit is decided, is set out in our post on how Leaving Cert marking schemes work. One caution from that post applies here. The SEC states in every scheme that assumptions about future marking schemes should not be based on past ones, and no scheme has yet been published for the new paper.

Is biology a good subject for points?

The grade bands are the same in every Leaving Cert subject. A H1 is 90% in Biology, in art and in applied maths, and it is worth 100 CAO points in all of them, as our post on Leaving Cert grades sets out.

What differs between subjects is how the marks are gathered, and Biology now gathers them in two unlike ways. The 200-mark investigation is work you do over months, with published criteria, a word limit and a fixed submission date. The 300-mark written paper is one sitting of 150 minutes, opening with a compulsory question that samples across the course.

Both components are large enough to decide your grade on their own. A H1 means being good at both, which is a fair description of the subject and not a reason to pick it or avoid it.

FAQ

What percentage do you need for a H1 in Leaving Cert Biology? 90% or above, the same as every other Higher Level subject. Across the two components that is 450 of the 500 available marks.

How long is the new Leaving Cert Biology exam? The SEC's Higher Level sample papers are 2 hours 30 minutes and 300 marks.

How many questions do you answer? Six of seven. Question 1 is compulsory, and you answer any five of questions 2 to 7. Each carries 50 marks.

What is the Biology in Practice Investigation worth? 200 marks, which is 40% of the subject. You submit a report of no more than 1,500 words and 20 images.

When is the Biology in Practice Investigation due? For the 2027 examination the SEC schedule gives a completion date of Friday 26 February 2027.

Are the old Leaving Cert Biology papers still useful? They are still useful for the biology itself and for the forms the questions take. They no longer show you the structure, because the papers up to 2026 were 400 marks over three hours in Sections A, B and C.

Do I still need to know definitions off by heart? You need to be able to give the exact scientific term when a question names a structure or a process. The 2025 marking scheme accepts synonyms in general and warns that some answers admit no alternative.

The ExamAI tutor works through real Leaving Cert biology questions with you, one part at a time, against the official marking scheme for that question. It asks you what you think before it tells you anything, then shows you where your wording earned marks and where it stopped short. That is what making learning personal means here.