Effectively Use Of Leetcode

I have been grinding leetcode for like 2 months.
At first I was unable to solve easy ones!
but now i am able to solve maximum easy questions, and some easy medium questions.
I have interview in next 3 months, what strategy should I take for solving maximum medium questions and some hard questions as well..?
I have like 5 hours of practice in weekdays and 8 hours on weekends.
Is that enough?
I am also taking help from EPI and CTCI.

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