hi,

see cutoff score changes every year and cutoff for psus depends on number of vacancy , students category, seat matrix, questions difficulty level etc. since there is very less vacancies comes for chemical engineering compare to electrical and mechanical, psus like iocl, ongc, bpcl, nlu hires for chemical engineers. so I suggest you to apply for all of the vacancies come.

you may use careers360 college predictor tool for knowing the chances of psu calling,