But my obc rank is 65740 then also i will not get any nit college ?

Hey Anjali, hope you are doing well. At this category rank, it is somewhat not possible to get into NITS as cutoffs generally close at 20k-30k in OBC category. If you belong to north eastern NITS like Arunachal  Pradesh, Meghalaya, Nagaland, Tripura, Sikkim, Manipur, Mizoram then there are chances other wise not. Nevertheless please wait for actual cutoffs to be out. You can apply for private colleges and focus on other exams like BITSAT, GUJCET, SRMJEE, VITEEE, etc. Hope it helps!! Good luck!!