What are the positive and negatives of extra marks, Byjus, Unacademy & Digital teacher?

Buying something is very easy to do but it is equally hard to pick what to buy. Making choice gets tough when there are so many options when it comes to online learning applications. There are a lot of parameters to consider before buying an online learning app. Here are pros and cons of a few online learning app that you could keep in mind before buying it for yourself or your child.

https://www.digitalteacher.in/blog/what-are-the-positive-and-negatives-of-extra-marks-byjus-unacademy-digital-teacher/