🎓India’s Best Subject Experts For Science and competitive Exams with proven results. Dabra Classes App is the Top-Exam Preparation App for Bank, Police, SSC, Railways, PSC, State exams, NRA CET & other Job Exams with Toppers and all India Rank #1 in several Exams. The person behind the whole idea of this mobile application is Mr. Sanjay Dabra sir who has always been passionate about teaching science to their students in the most friendly and easy way possible. Along with Sanjay sir, this channe