i m currently pursuing my BE , but i want to prepare for upsc. i m in my 4th sem so when should i enroll for the upsc classes?

U have lot of time to prepare study for UPSC.fist u choose ent. sub.then check some classws in ur nearest city. n attend its demo class then select one of the best class. don't forget "lot of harwork,give u better success"

You should enrol after completing your BE so that you can focus on both (BE and UPSC exam) at separate times and in a correct manner.