The last point is important. When you're in a university you take different courses over the years but they often reuse or are based on some of the material covered in earlier courses. You learn by repetition and as you go into more advanced topics you can often understand better what you learned before - because you learn connections between things.
But when you need to learn a lot of things in a short period of time you don't have time to reflect and think how it all works together.
I find this often in my programming projects. Each sub-project requires a lot of focus and concentration. That seems to make it easy to forget about the previous (sub-)project almost totally. Putting in lots of new stuff into your brain means some older stuff gets pushed out of there.
The more you learn the more you forget. The only way to fight this is to try to understand the connections between the sub-topics, but if you are in a hurry you don't have time for that.
But when you need to learn a lot of things in a short period of time you don't have time to reflect and think how it all works together.
I find this often in my programming projects. Each sub-project requires a lot of focus and concentration. That seems to make it easy to forget about the previous (sub-)project almost totally. Putting in lots of new stuff into your brain means some older stuff gets pushed out of there.
The more you learn the more you forget. The only way to fight this is to try to understand the connections between the sub-topics, but if you are in a hurry you don't have time for that.