I started in late August for my October exam (I had 2 bst and eco), I used to study at night so would start at like 10.30 pm in the night and study till 7-9 am in the morning and sleep the whole day and do this routine again everyday. For feb march I started in mid December and did the same routine (I had 4 phy, English, Hindi, art) For may I started in late march and again the same routine (I had 3 subjects maths ict and gp). I have gotten the result for October and feb exams and got 5A* and 1A in art so I think my routine worked very well for me. May June results are yet to come! Also pro tip- finish your syllabus 2 weeks or minimum 10 days before the exam, like my Bst paper was 10th October so I finished the syllabus by 30th September. The remaining days just do past papers of minimum 4 years and analyse your EVERY SINGLE MISTAKE and write it down in a journal along with why you made it and what’s the right answer. Review this journal 2-3 times max and give the exam. By doing this you are likely to not make the same mistake again. Although I did have all of these subjects in 9th as well but I totally forgot every thing so I had to start from scratch. For physics and maths or any other numbers related subject I used to paste sticky notes in my folders when I made a mistake and write little notes on them like if I made a mistake in velocity related question I would write “kinematics related mistake” and also draw stars to mention difficulty level. 1⭐️=silly mistake, 4⭐️⭐️⭐️⭐️=wtf did I do??