Hello,

You can give as many choices as you want.But make sure that you only fill the colleges and branches you are interested in.Prioritize your colleges and the branches which are in it.Go through the previous year cut off and check the chances of getting seat in a college give the first priority to them.You can check GATE cut off for IITs and NITs here https://engineering.careers360.com/articles/gate-cutoff

Our GATE college predictor will help you give the chances of getting seat in a college based on previous year trends and your score, please try it