Q: The present experiences are result of past karma. If we know the mistakes committted before, we can rectify them.
A: If one mistake is rectified there yet remains the whole sanchita karma from former births which is going to give you innumerable births. So that is not the procedure. The more you prune a plant, the more vigorously it grows. The more you rectify your karma, the more it accumulates. Find the root of karma and cut it off.

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Be as you are
The teachings of Sri Ramana Maharshi
edited by David Godman
a Penguin Book

Death Valley...