How to prepare for April attempt with boards?

Soo like. I go to a regular school and I started my "prep" in 12th. I never really prepared well for it but im getting like 83 in it (23s1) and i reallllyyyy regret it. The questions were actually doable. But due to poor time management i even left 2-3 sure shot questions. Exam ke pehle I fr thought ki 3 ghante kya karke baithungi. Ghanta kuch nahi padha. but then☠️ Anyways, 50 days left, how do I move forward? For mock tests do I give pyqs or like some other institute's? How many mock tests in a week? mai hamesha Yt peh pyq solving sesh dekhti hu kisi new ch ke theory padhne ke baad. so that I have a clue on how to go about solving the questions(for math). Is that a waste of time? should I just jump to qs solving after theory? Abhi bas 12th ke syllabus pe focus karu toh kya March me 11th cover ho payega? I'm a complete newbie in this scene, so lay all your wisdom on me.