Don't worry,I'm using BEST's own site for the bus numbers.I'm coming from Mulund.It seems a 496 Ltd with a changeover at Bhandup Station to 422 will do the job to get to National College.
Look for buses from Kurla Stn. That will leave you fresh for the meet.
I also found that 422 goes direct to Bandra from Mulund.Can't be fresher than that.:)