Hello

There are a lot of apps available for CBSE class 9 and 10 exam preparation. But be dependent only on an app is not good decision. I suggest you to watch YouTube videos for doubt clarification. Read NCERT books as these books are best for covering CBSE class 10 syllabus .

Along with it, make notes regularly for important topics and formulae. You can use Careers360's NCERT solutions to know how to solve the questions.

In case of any doubt, ask question to Mr. AL.

Meritnation

Meritnation is a popular app for CBSE board exams preparation . The app has been downloaded by more than 67 thousand users on play store . The app has a diversified  collection of sample papers , NCERT solutions , nad animated tutorials . The app also promotes social learning and allows a use to create profile and add their friends . Social learning helps in comparing the level of your preparation with that of the others .

There  are many more apps for CBSE learning like myCBSEguide ,Toppr,... etc