Yes, since you belong to the SC category, scored 61% in 12th from West Bengal (your home state), and got 87 percentile in JEE Mains, you are eligible for JoSAA counseling. With 87 percentile and SC category, you have a chance to get admission in NITs, especially in lower or home-state quota branches like Civil, Mechanical, or Metallurgy in NIT Durgapur or other newer NITs. Fill your choices smartly and keep options open. You do have a good chance!