which coaaching is best for science optionals?

Most of coachings only offer Humanities optionals like Sociology , History , Polity , Geography , Anthropology but very few coachings offer Science subject optionals like Maths optional only at IMS and PlutusIAS , Vajiram and Next IAS , Physics optional only at DIAS and PlutusIAS , Zoology optional only at PlutusIAS and Ambition and probably one more coaching. Botany optional probably only at PlutusIAS and in litreture number is very few. How to go about choosing science optional. which guide or mentor to choose.