I have used byjus and know it well and will be sharing experience with you.
So byjus is available in play store also ( for free) which gives you access to all videos for about 14 days. It has nice videos full of illustrations making it more attractive and effective.
After that you have to purchase byjus premium which is like the cost of a normal coaching.
It provides you with mentor support, online portal to ask questions, offline access to videos, a tablet, its imaginarium, a workbook.
It teaches you maths and science.
ONE DISADVANTAGE I FOUND THERE WAS THAT IF YOU HAVE A CONFUSION YOU WILL BE BOOKED AN APPOINTMENT WITH AN EXPERT WHICH TAKES ABOUT DAY, THUS TAKING TIME TO SOLVE YOUR QUERY.
ANOTHER THING THAT YOU DO NOT REQUIRE IT TILL CLASS 8 BUT IF YOU WANT YOU ARE FREE.
FINALLY I WOULD SAY YOU CAN BE TAUGHT BY INDIA’S BEST TEACHERS AT HOME AT SUCH A LOW COST. IF YOU UNDERSTAND IT BYJU’S IS THE BEST.