Learning in Japan?

If I were to enroll in a Japanese Language school would there be other places that I would be able to keep up with my studies so I could get into a Japanese college after the Language School?

From what I know, a language school isn't an official school. You simply learn the language like you would in school unless they give you credit for what you learn.
I went to a Japanese language school in
middle school for 3 years and didn't get credit.
If you want to study Japanese in a japanese university try sophia or temple university.
Hope that helps :)

Many Japanse language schools offer preparation courses for those who are going to college/universities in Japan.
Here's the database of the Japanese language schools in Japan, you can check which schools are offering such courses.

http://www.aikgroup.co.jp/j-school/english/index.htm