A time to cast away stones, and a time to gather stones together

It doesn't matter how many times I was told that, only people who understand how poor their knowledge is can be develop true wisdom, it doesn't help.
As closer it comes to exams as stronger I feel my misery. First month of studying here I felt how knowledge come and fill in my brain. At the moment i feel like my brain messed and stocked. I don't feel being intellegent anymore. I feel being stupid. Never in my life i was studying that much for some long period of time (4 month for now) but I feel like I'm still a bit behind...