Solve lot of questions marked Easy on these platforms. They help in clearly understanding the topics learnt.
Once you have mastered Easy section, start with Medium level questions. As a rule of thumb, doing around 150-200 Mediums is considered a very good number!
Only when you are comfortable in solving 80% of Mediums, start approaching Hard level. Solving 20—30 Hards is more than enough for majority of interviews !
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