AQA A level Biology specification: https://www.aqa.org.uk/subjects/science/as-and-a-level/biology-7401-7402
OCR A level Biology specification: https://www.ocr.org.uk/qualifications/as-and-a-level/biology-a-h020-h420-from-2015/
AQA GCSE Science specifcations: https://www.aqa.org.uk/subjects/science/gcse
Edexcel Science specifications: https://qualifications.pearson.com/en/qualifications/edexcel-gcses/sciences-2016.
Full revision site - https://app.senecalearning.com/courses
Lovely revision site - https://www.s-cool.co.uk/
One of my favourites - https://bigpictureeducation.com/cell
New to note taking - https://www.wikihow.com/Take-Cornell-Notes
Cell structure - https://byjus.com/biology/cells/
I would highly recommend Steven Smith if you are looking for expert online chemistry tuition, he provides quality tuition and shares the same values and ethos towards education as I do.