Hey everyone, I'm a pretty new student of Japanese, about one year now.  I've been trying to create sentences but I'm a little stuck on one.  What I came up with was this:
I went to school and studied for a test at the library.
My translation was:
Gakkou ni itte, toshokan de skiken no tameno benkyoushimasu.

Problem is, it doesn't seem quite right.  I think I'm doing something wrong with the tameno/ tameni section.  Also, I'm trying to keep it formal, hence the -masu.
Any help is greatly appreciated!