how can I(17F) get 85+ in bio class 12

I am a PCMB student and my primary focus was on Jee

I never made any short notes for bio nor did I read ncert properly

my marks in preboards are 24/70(PB1), 35/70(PB2)

SO CAN YOU GUYS PROVIDE ME THE INFORMATION AND RESOURCES NEEDED TO GET 85+ IN BIO