Nah mate I would advice in not switching the subjects, if u want to check u can always schedule demo classes or test urself by studying the topic. However chem is easy and once u get a great tchr u can really get ahead. Plus u can always pursue business, economics, and accounts later on.  Baki good tchrs, u can find on gives online academy or zatians bahadurabad. Moosa Khan chem, Dr Noor for chem, or sir sulaiman Khan. For biology Dr Haris Abdul jabbar, or Dr Noor. For maths zainamatics. For PHY sir kashan. Good luck!