what is the percentage(less than or equal to) of problem solved of a specific rating by my own to realise that i should still practice this particular rating or rating range and not go for higher rating problems yet.
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I think there's not any fixed number of problems of a particular rating. If you're comfortable with a specific rating x for a considerable number of problems practiced, then you may move to x + 100 or x + 200 rating. Someone might get confident on a rating x with 50 problems, but someone might need 60-70 problems as well. It depends on individual and his/her practice and consistency.