Hey, Today I am going to review Byju’s(Mumbai).So first of all its India’s first initiative for long distance coaching via animated stuff, secondly the videos they provide are totally awesome and expressive.many people criticise the app but the videos are really awesome and easy to learn.You would understand every concept if you pay keen attention to each of its videos.You can know the prices at https://byjus.com.There are several packages for std4 to std 12.So I definitely recommend you to use it!.Best of luck!