i have got 23079 rank in mains and 21000 in iit.this is my college preference in josaa counselling. please tell me should i do some changes in it or not?

If you are not happy with the institution allotted to you as per the counselling sessions of JOSAA, then you may certainly make a search for an institution on your own, just bear in mind that there should be three requisite elements in those institutions like – Widely Experienced faculty members, Sound placement record and handsome salary package. If I am to recommend a good place with all  the aforementioned elements, then i’d suggest – Quantum School of Technology, Roorkee,..................BITS, Mesra,.....................Lovely Professional University, Phagwara