What do you do if you missed vital lessons, or weren't paying attention, or lost the notes? It's not too late to catch up on missed topics, if you know where to look.
Once you think you've learned the material, how do you check? Asking other people can to test you can be daunting, but you can always ask a website to do it for you.
An excellent website by Collins, the educational publishers. Great online tests to help you check your knowledge in English, Maths and Science. It takes a couple of minutes to register, but is worth the effort.
Detailed study notes on Maths and Science. You can even download lessons to your mobile phone (why do you think they’re not allowed in exams!) at http://lgfl.skoool.co.uk/futureskoool.aspx?id=91
Skoool’s Key Stage 4 section has detailed maths and science lessons exploring all the major principles. If you missed a few classes, start from scratch with this section. The lessons even talk to you.
S-Cool revision guides cover Biology, Chemistry, English, Food Tech, French, Geography, German, Maths, PE and Physics.