hello i scored 81% in ssc n 57% in hsc? m confused as i m intrested in forensic bsc n my parents want me to go for polytechnic in chemical?

You are right and your parents are not correct as after Polytechnic diploma, you will be a technician where as B.Sc. forensic followed by PG will have good career options. Beside, it is a degree which should be always preferred over diploma.