Hi Shinjan, as you haven’t given further details like the city/area for which you are looking for the tutors, we are providing you a general information based on our study.
According to our study, Vedantu (having branches in Delhi, Patna, Jaipur, Bangalore, Chandigarh, Kolkata among others), Urban Pro (having branches in Delhi, Gurgaon, Noida, Bangalore, Chennai, Ahmedabad etc.), NIO Schools (based in Ranchi ), Tutorindia (they provide home tuitions also) look some of the renowned online tutoring portals. We think they will be able to quench your thirst of guiding you in the disciplines of math and physics. Just Google them and find your best option.
Besides, you always can avail the benefit of honing your preparation through EduGorilla sample papers and EduGorilla question papers, tailored specifically for NIOS programs. Hope, the answer will find you in fully satisfied condition. All the very best for your future!