1. Know the definitions.
There are a lot of marks on the paper available to you just for knowing the definitions. Don’t make up your own versions in the exam, just memorise the standard, accepted ones. Use flashcards to help you learn them. Here is a monster quizlet of Leaving Cert definitions on digital flashcards in Quizlet: https://quizlet.com/495416714/complete-leaving-cert-biology-definitions-flash-cards/
2. Practice drawing the frequently asked labelled diagrams. Draw simple, two-dimensional diagrams without shading or colour, and use a ruler to draw the label pointers no arrows, which must touch the thing you are labelling.
3. Become an expert on Unit 1 (Scientific Method, Biomolecules, Ecology) and Unit 2 (Cells, Enzymes, Photosynthesis, Respiration, Genetics).
4. Learn just one method for each of the Mandatory Practicals when revising, the easiest one you can find. You don’t need to have actually carried out a practical in the lab to be able to get full marks in a section B question, so don’t worry if you didn’t get a chance to do a particular practical.
5. Biology exam marking schemes usually award 3 marks for each point given in an answer. Knowing this, analyse a question to estimate how many points you need to give in your answer. For example, if there is a question worth 9 marks, be sure to include three distinct points when answering.