I am a student of class 12th and am not taking any coaching classes for JEE preparation. Which is the best IIT JEE preparation app?

The IIT preparation apps are plenty these days so we cannot judge any app as we don't have any idea about their preparation method. And it also depends more on the student than the apps. So whatever you choose, your effort matters a lot. Choose the one of your choice and also put a lot of effort as