Hi Dipali!
Have you heard about Socrative!! Socrative is an online student response system that allows teachers to easily create polls, quizzes and other educational exercises for their class and monitor their students’ response and progress in real time, using smartphones, tablets, or PCs.
Moreover, I personally do use Google Classroom too which is a free web service, developed by Google for schools, that aims to simplify creating, distributing, and grading assignments in a paperless way. The primary purpose of Google Classroom is to streamline the process of sharing files between teachers and students.