will i get mechanical engineering branch in category 1 or 2 with a rank of 8305 ?
With a JEE Advanced rank of 8305, securing a seat in Mechanical Engineering under Category 1 (General) or Category 2 (OBC/EWS) at top IITs is unlikely.
However, you may have chances in NITs through JEE Main (not Advanced).
Check past cutoffs here:
IITs Cutoff for Mechanical Engineering – Careers360