How long before GCSE exams should u start revising ???
Most researchers suggest starting 10 weeks before your first exam for the top grades, but everybody's different - some people will start 3 weeks before and burn out, others will start 20 weeks before and keep up their revision right until the end. I'd suggest a bit of trial and error, start with plenty of time to go so that you can afford to take breaks if you feel yourself starting to burn out. Good luck
For me, I started to revise early (eg. December) for the subjects that I was struggling in, or wanted to get A* in. Eg. I really wanted to get an A* in maths, after having only gotten an E in Year 10 so I started to revise for maths during my Christmas break, we'll see on Thursday if it has paid off, but nearing the start of my exams I was achieving A/A* in my classroom mocks.
On the other hand, I was really strong in my science subjects, so I didn't need to revise for them until February/March.
I think I technically started feb half term, doing a small bit of maths. March/April was where I started science and maths semi properly, doing what I could, but May was full on everything. Or it was supposed to be anyway, I left quite a few subjects with less than a month to go, RE, ICT, History, few others. Certainly not wise, I'll change for A levels hopefully, but try to start 2 months in advance or more.
How long before GCSE exams should u start revising ???
Some people would advise against this but I would start revising subjects at different times. I started the sciences in January as I was not confident, I had failed my year 10 mock in chemistry, and had all 3 at a* in the mock before the exams. However, I started revising media studies a week before the exam and it felt like one of the easiest exams to me. Some subjects need more time than others and I would concentrate on weak subjects more. However, make sure you don't ignore your preferred subjects completely though.
Completely depends on the person. I finished all my resources by January but didn't start actually revising until mid March. If I started any earlier I knew I would have got bored of it too quickly and wouldn't have wanted to revise when it actually mattered.