If you are looking for a good college, you need a 90% or higher. There are Hindu, Ramjas, KMC, SGTB, and Hansraj for Political Science. And, to assist you further, Ramjas and Hindu College are the best choices among these. 

Keep a close eye on all of the deadlines before applying for admission. Go to North Campus on the day of the first cutoff. There are many senior students who can advise new students on good colleges, exposure, faculty, infrastructure, and so on. You should visit different colleges based on your cutoff and talk to everyone about the subjects you have to study in addition to Political Science because each college offers different subjects that may or may not be of interest to you. 

You should also look at college rankings. You must not forget to follow these steps before going straight for admission: carefully check cutoffs, visit colleges for guidance, and change admission if necessary if you get a good college in the next one.