For Testbook Website:
Your all Courses are available under your SuperCoaching > Courses. Here you'll get all of the courses according to subject and exam, just scroll down and check all of them.
We are also enclosing the screenshot of the same for your reference.
Also please note, you have to 'Add courses' manually to 'Start learning' as needed. The Add course option will be visible like below image example.
For Testbook App:
Here path is same Courses are available under your SuperCoaching > Courses. You'll get all of the courses and 'scroll to the right' to get courses according to subject and exam here.
We are also enclosing the screenshot of the same for your reference.
Here also you have to 'Add courses' manually and open them to 'Start learning' as needed.
The Add course option will be there like visible on below image example.
Hope it helps, Happy Learning!