When to start revising for GCSE's?

I am currently in Year 10 and am fast approaching Year 11. Judging from a large section of threads on TSR I can tell many people started their revision very late and wish they had begun revising earlier. Through personal experiences do you know when it is best to begin revising?
My grades at the moment are:

Biology: A*
Chemistry A*
Physics: A*
Maths: 7 (A)
English Lang: 7 (A)
English Lit: 7 (A)
History: A*
Geography: A
R.E: A*
French: B (If I continue my hard work, I am certain I will achieve an A*)

I'm in Year 11 and tbh I revised all through Year 10 and into Year 11, but that is probably excessive. If you have mocks in Year 11 take them seriously and use that as practice revision to gauge how much you need to do. I would say from Christmas you should start revising maybe an hour but by Easter Year 11 you should be fully into it.

If you ever want to ask questions or see how I am structuring my revision you can have a look at a GYG thread I have http://www.thestudentroom.co.uk/showthread.php?t=3897511

Ok, I have been revising thoroughly throughout Year 10, however, it is not revision which I would class as preparation for exams this year. I was intending on starting as soon as the Summer holidays begin as I am fairly busy at the moment with revising for the Mocks which are approaching. Thanks for the advice.

As soon as possible. Do you want to go into each and every exam feeling utter confidence? Then start now!

Good luck!

I am currently in Year 10 and am fast approaching Year 11. Judging from a large section of threads on TSR I can tell many people started their revision very late and wish they had begun revising earlier. Through personal experiences do you know when it is best to begin revising?
My grades at the moment are:

Biology: A*
Chemistry A*
Physics: A*
Maths: 7 (A)
English Lang: 7 (A)
English Lit: 7 (A)
History: A*
Geography: A
R.E: A*
French: B (If I continue my hard work, I am certain I will achieve an A*)