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The best tip for any revision is to start with the past exam papers and work back from that. Otherwise you will spend a lot of time revising the wrong stuff, or the right stuff in the wrong way.
All past papers and mark schemes are available for free for you to download. You need to know your exam board and specification, but you can start here:-
Edexcel - http://qualifications.pearson.com/en/support/support-topics/exams/past-p...
OCR - http://www.ocr.org.uk/i-want-to/download-past-papers/
AQA - http://www.aqa.org.uk/exams-administration/exams-guidance/find-past-pape...
Also, find a million revision tips to make sure you spend your time effectively herehttp://www.s-cool.co.uk/content/revision-secrets-no-end-insider-tips-psy...
Need help. Any good websites apart from BBC Bitesize?
I don't understand how and why yoku get high ionisation energy please help!!
A bond angle is the angle formed between three atoms across at least two bonds.