If it's Edexcel, then it's 62 days (just under 9 weeks).
You have plenty of time. It's possible to learn an entire module in the space of one weekend if you spend all your time doing that. I did this with S3/S4/M4/D1 (spending a weekend on each). For me, I never do all the questions in each exercise, I just do the harder ones, the ones that I think will be likely to appear in the exam, and the past exam questions.
I didn't know anything in S1 until 2 weeks before. I got 84A. Learn content. Learn how to use formulas. Memorise Formulas. Apply to book questions. Apply to past paper questions. Sit exam. Obtain A.
I didn't know anything in S1 until 2 weeks before. I got 84A. Learn content. Learn how to use formulas. Memorise Formulas. Apply to book questions. Apply to past paper questions. Sit exam. Obtain A.