If you’re predicted an A*, then i assume you know most of the stuff, so the focus must be on testing yourself. Specimen or past papers with marking schemes are best – get hold of any examiners reports from the exam board website if you can – they’re really useful to point out common mistakes. workbooks and exam papers are good. BBC bitezise tests are good. Any collection of questions is good as long as you have answers. Looking through the glossary in your textbook is also a good idea – you need to know all the definitions.
I wouldn’t worry too much about setting up timetables at this stage – your life is on hold right now – it revolves around getting ready for the exams – so the key is to be able to pace yourself. Test yourself for a short period, then break and relax. Find your best routine.
Let me know if I’ve missed the point entirely!