Yes, your grades for a GCSE Math coursework do have some value. And school had to prepare you well enough for writing one. If we are talking about school preparation, you should have solid notes to use and a list of sources to turn for help to. You should also have a list of prayers to say while writing a GCSE Math coursework and a couple of threatening addresses in case your GCSE Math fails. Just kidding.
 
Here are the things you have to be aware of when dealing with GCSE Maths:

1. Theory. Mathematicians of all years and epochs will cry hysterically from their portraits if your GCSE Math ruins the basic rules of study. Certainly, there are plenty of theories that you will have to keep in mind, but the rules are strict. If you want to succeed, you have to be above the average level.
2. Numbers. GCSE Math will have enough of different figures to make your head dizzy. The most important thing about writing GCSE Math is concentration and attention. Not only all the numbers and answers have to be checked. Find time to go back and double-check all the results you have received.
3. Writing. GCSE Maths deals with numbers, and that is true. But apart from Mathematics itself there are sentences and words that tie numbers and results together. GCSE Math is not an English coursework. Still, do not let the mistakes be at least too obvious, and if words are your weak side, try to use their most simple forms.