The contents of the courses here are based on the books:  

In addition to the above book contents, questions of recent years are also being worked and added periodically. Videos for quick review of theory, and typical problem solving are being added.

The questions are predominantly from GATE-CH 1988-2022, and typical questions from other relevant streams of GATE, and other sources.

You shall buy, or see the reviews of the books at or flipkart.