My btech overall score is less that is SC,is any effect to get seat in IIT and Jobs in PSU through GATE score ?
Gate rank is the most important factor undoubtedly, if you have a good gate rank than your college scores doesn't matters. PSU's in taking through gate don't looks at your BTech scores. Your Gate rank is the prime factor.
Also if you have a good Gate score and rank then you have given the interview/GT then only you'll get selected for the job. So don't worry about your BTech scores.
All the best.