You will never feel confident enough. That feeling of doing 20 more LC questions to feel more confident will always be there. Start interviewing with company which has somewhat challenging interviews but you don't want to join. This way you will be able to find out your weakness before main show
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Finish at least 200 medium questions before interview.
I have finished more than 200 questions and still wanna prep more to feel more confident
This way you will be able to find out your weakness before main show