Is it normal for your intelligence to drop?
I'm a 19-year-old and I believe I'm highly logical cos I'm a type-A-personality guy and I've been a straight-A-student. But as I go through academics, I notice a decreased speed in my thinking. This includes a slight difficulty in calculating coins (I'd seldom approach to use my fingers), completing the square or fast reading while not completly recalling or understanding what I just read. I sometimes have to slowly and aloud read whatever I want to thoroughly comprehend. When I read a story filled with a lot of jargon, I have to re-read it at least 3 times to completely understand it. And I feel my brain is compressed with a lot of stuff I have no use for (full brain if I may). So, is it?