If we talk about meritnation, It is good for the students only If the students need any ncert solution and sometimes that solution also is not related to NCERT.
If we talk about the pros and cons of these app they are as follows : -
First we will look at the,
PROS : -
The app interface is really very intereactive and amazing.
They provide NCERT Solution with them.
They have test generator which is good.
They provide board paper solution of past years.
Now if we talk about cons.
1) the most important the fee are very high no simple person can afford that it is really high for 12 months. Studying on your mobile or desktop is not affordable by paying fee. It don't have any gurantee that whether the doubt will be cleared at the same time when we get the doubt. Sometimes it is possible that your doubt will not be cleared at the same time.
Better than these paying for coaching classes as the students is in front of teacher and the teacher is in front of student which is the best intereaction.
So it is one of the con that fee is very high.
2) The video are not easily understandable.
3) if you need previous solved questions paper you can check it on net.
But paying these much and getting not fulfilled study plan is not at all affordable.