I've got prescribed Ativan 1 mg for anxiety.

Now I've read a bunch about it and seems like it might make you sleepy/have worse memory. If so, is there even a point to take it when I am in college?.. I need to be able to study...

Also, I saw that most people get prescribed 0.5 mg to start with, do you guys think 1 mg is too much? Should I try to break it into 2 pieces?

Thanks!