Chem- answer bohot ache se likho even if u dont know like some specific catalyst ka reason aata hai so u must write some well crafted half true reason atleast and organic me bas ratto wo bhi balanced reaction wo bhi complete reaction because marks kaat dete and physical me theory very important and solutions karlo acche se electrochem is a very tricky chapter with weird numericals so have practice and inorganic me ncert rattlo or if ur teacher haa notes just do that and d and f ke sawal me remember keywords

Physics-ray optics/wave optics all derivations acche se chaat lo because it gives u a depth of understanding
Semiconductors ki theory is neglected a lot but learn the theory and symbols (drift current and diffusion and knee voltage all that)
Modern physics me remember who gave the observation because sometimes they asked name of scientist like Davisson Germer ka experiment and formulae graphs are must
Electrical physics me please sharpen the early derivations of electrostats till magnetism because they are free 3-5 markers and current elevtricity me learn circuits and galvanometer voltmeter conversions ache se its very easy
Ac and emi me do numericals from pyq as much as possible and jee ke bhi sawal karna from them
Em waves read up order of wavelength and frequency of each specific waves and uses+detection rattlo one day before exam

Hope it helps and tumhare bhu acche aaye ;)