Hello

It's good that you're sacrificing your sleep to achieve your goal. And this kind of determination is highly required to become successful.
Well, as per your query- I would tell you to sleep at least for 7 hrs. Sleep is equally important for body (relaxation) + the brain. The brain also gets tired and needs rest at certain intervals. And in that case if you're studying continuosly and giving load to yourself- then it's very obvious that at certain point you may go blank and may fail to recall the stuff that you've studied many times. And so far it'll affect your learning capacity too.
So concluding to it, don't take any kind of stress and study- rather enjoy your studies and perform well. This is the peak time and you need to revise + practice maximum.

Hope this helps.!
Good Luck.!!

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