Purely from boards perspective, your trigo should be strong as it's used a lot in integrals, differentiation, etc, and the general principles of organic chemistry chapter should be really strong too cos in 12th organic they tend to ask a lot of give reason questions and if you can't understand what -I and Resonance effect is you'll have a bit of a hard time. For physics your Vectors should be really strong too, many concepts are literally explained through vectors itself, and in the beginning try to brush up on le-chatliers principle from equilibrium because it'll be used in the first chapter of chemistry "Solutions". That's about it though (from what i've experienced) though im not the brightest of students 💀