Now now. The schools do overhype mocks a lot, but you still should take them seriously. Think as mocks as a way to get extra revision. Personally i say screw having a revision timetable, as long as you revise for your mocks. The schools make them quite regular aswell which is helpful.
Mocks are exactly what they say, but it does not mean you should ignore the results. If you are wanting to get a*s and a's if you are getting C or even B you are at risk of not doing well. Its almost christmas now and exams are coming sooner and sooner so get stuck in, and take the mocks seriously! I am not advising you to spend hours a day revising on top of your homework, but I recommend when you know what dates your exams will be, start preparing a week or so before. The biggest tip in GCSE is it is all understanding. Especially in maths. Whenever you cannot answer a question, get help, and understand what you did wrong or missed. Your brain is clever like that... it remembers your past mistakes which mocks reveal and so the next time you see it, you know how to ace that problem! Understanding is especially key to science and maths, as you know the formulas, but do you know how to apply them correctly?
It is good to see you care about your results. You don't have to be a study nerd or something who does 3 hours revision a day extra, just keep on top of it.
Whenever you get stuck or lose marks in a question, find out why. That is key to success. Know what the examiner wants in a question, and know where you receive marks.