Dear student,
To know about the difficulty level of jee mains you can look at the previous years question papers of jee mains. Also you can join any test series or the test series released by nta. The link for downloading the previous years question papers is as follows:
https://engineering.careers360.com/articles/jee-main-question-papers/amp#referrer=https://www.google.com&csi=1
Also you can look at the sample papers from the following link:
https://engineering.careers360.com/articles/jee-main-sample-papers

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