For Testbook website:
Practice sets are available under Your SuperCoaching > Right of Dashboard > Practice tab. We are also enclosing the screenshot of the same as an example for your reference.
Here, click on any subject to see 'Chapter wise practice sets' and also you can search for a particular topic using 'search chapters' box like visible below.
For Testbook App:
Please go to Supercoaching tab > Scroll to the right of Dashboard and you'll see Practice Tab is there. We are also enclosing the screenshot of the same as an example for your reference.
Here tap on any subject to see 'Chapter wise practice sets', like visible below.