Can you stretch your brain and intellectual ability with training?

jennifer_bloom
When I first started high school, my brain was exhausted from the change in academic pace and I would often fall asleep after just 20-30 minutes of math homework. In my last year of high school, I had no issues with exhaustion from doing work.

When I was new to university, I would fall asleep after 1-3 hours of text book reading and in my last year, I was able to memorize 700-900 pages in 3 days. I once memorized the entire course readings for class during the 3 days before the first class began and usually devoted less than an hour to the course readings each week since I memorized it all during those 3 days.

Recently I made a new intellectual achievement on a research project I’m working on and I was totally exhausted just a few hours ago, my exhaustion lasted around 1/2 to 2 hours. I wonder if God is improving my abilities again.
Can you stretch your brain and intellectual ability with training?
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