OCR released the OCR A June 2017 H420 papers. I combined the Biological Processes 420/01 paper with the markscheme to make it easier to follow and interpret.

Plant reproduction - videos questions and resources

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Stunning video and images from Royal Microscopical Society 

Homeostasis - Glucose and Temperature - for AQA and OCR

Question Pack, Videos, Powerpoints

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Question pack, powerpoint and videos on the liver 

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OCR A Level Biology A H420/01 Biological processes Sample Question Paper - as an online quiz

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OCR AS Level Biology A H020/01 Breadth in biology Sample Question Paper - MCQ as Online Quiz

OCR A Level Biology A H420/02 Biological diversity Sample Question Paper - MCQ as an online quiz

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OCR AS Level Biology A H020/01 Breadth in biology May 2016 - MCQ as an online quiz

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A-level Biology Questions by topic : Spirometer and Lung Volume Questions - powerpoints and Videos

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A-level Biology Questions by topic: Magnification Calculations and Graticules - how to do magnification questions

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Top Tips !

• Never write "amount" you mean mass, volume or concentration. 
• Refer to "a control experiment" or "a variable that I will control (and then name the value and method of control)" but never to "a control variable"
• Independent variable is what you change.
• Dependent variable is what you actually measure in the experiment (not rate).
• Organisms vary from each other unless they are clones !
• When you suggest improvements think about improving the method rather than the equipment (e.g. control a variable that wasn't previously)

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A-level Biology Questions on Kidney Dialysis and Transplants - useful powerpoints/animations and videos 

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A pedigree analysis, an epistasis, and a Hardy-Weinberg - useful for OCR Revision

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Pre-U synoptic exam question -  Xylem and transpiration. Transport of Water in Plants

Outstanding synoptic question on muscles and contraction. Excellent practise

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 Enzymes -  Questions (and answers) - for A-level Biology - With Videos and Powerpoints to help recap the theory.

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How to approach the Cardiac Cycle and answer A-level Biology Questions on mass transport in animals. Lots of past paper questions. Cardiac Cycle of the Heart and Transport in Animals Questions for A-level Biology - with video and PowerPoint to recap the theory.

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A-level Biology questions by topic with markschemes on Evolution, Biodiversity and Classification. Video and PowerPoint to help you recap the theory. For OCR A Biology and other specifications.

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Questions by topic for A-level Biology  - Genes, Genetics and Genetics Engineering, for OCR A, AQA and Eduqas

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