Sr i got 90.8%in my best 4 subjects in PCB with english. Can i get admission in DU in sciencs stream?

Yes, you can get into DU bsc courses with this much percentage. It might be difficult to get through in the first cutoff (if you belong to general category ) but you can surely get it in the third fourth cutoffs.
Please check the last year cutoffs available on the official du website www.du.ac.in to get a fair idea about the past trends of cutoffs and colleges available.
Wish you all the best.