It depends what exam board you are working with, check with your teacher and ask them because you want the one that fits well with your course so that you are not trying to memorise unnecessary information.
Revise maybe!!
For a complete guide on when to use simultaneous method in indices maths visit mathsrevision.net/gcse-maths-revision/algebra/simultaneous-equations
The best revision website is BBC Bitesize as it has revision for all ages such as: KS1 KS2 KS3 GCSE Scottish Highers
not bbc bitesize there is nothing there!! maths English and science 5 gcse i think:)
write down the important figures in history and the dates and era(like renaissance) and write down what did they do in history. For geography, learn how to read the grid references and types of houses judging from street patterns and contour lines.
To pass your GCSE's and have a career of your favourite, you must revise. Some examples are: revision games, internet resources...
Most people would say the CGP guides, which are pretty good and are great for some light revision. If you have an iPhone though, there are loads of really good revision apps which are a lot cheaper. My favourite are the 'RevisionNerd Biology' and 'RevisionNerd Chemistry' apps for GCSE. They're clear and concise, but probably the biggest advantage is the fact that they're portable, and that they're only £1.19. Hope this helps!
History
You can visit igcsechem.webs.com (advanced) or ks3science.webs.com (basic) to learn more chemistry!
Yes. If you are looking to get a flamingo you must contact the RSPCA. However if you are here because you don't know the answer to the question in your science GCSE revision guide, don't worry, this question doesn't come up in the exam.
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'Gamma is very penetrating, needs many centimetres of lead or many metres of concrete to absorb most of it.' Reference: Goodman. N, 'Essentials: OCR Twenty First Century GCSE Physics Revision Guide,' Page 28, Letts and Lonsdale (2008)
The BBC Bitesize revision site is intended for GCSE revision and upwards to A and AS levels. It is however also useful for some KS3 work especially in Year 9 with regards to mathematics and sciences.