My Campus life

Boston university, where I studied English language, has exploited uses (or maybe has begun using, depending on what you mean) electronic tools for running any academic situations such as the registration of the registering for classes (or class registration), the admission of the students (it is most common to just say admissions), and payment for of the tuition fee.

"Exploit" means to use something in order to gain an advantage. It often has a very negative connotation--meaning that the person is using something unfairly or for bad reasons.
EXAMPLES:
-The company exploited their workers for the sake of profits.
-He exploited legal loopholes to avoid paying taxes.
-Child labor is exploitative.

I was surprised by such a system in at BU.

When you use the passive, you need to use "by."
-The dog bit the child --> The child was bitten BY the dog.
-My sister ate the cake --> The cake was eaten BY my sister.
-A sudden noise startled him --> He was startled BY a sudden noise.

Because I have never experienced it in Japan, although some big universities has use the same method in Japan, although.

This sentence should be connected with the one preceding it: "I was surprised by such a system at BU because I had never experienced it in Japan, although some big universities use the same method in Japan."
Also, "although" can never end a sentence. It always begins a clause.
-I told my mother I liked the cake, although I thought it tasted too bitter.
-I acted like I believed him, although I knew he was lying to me.
-Although she looked happy, in reality she is very sad.

When I was a university student in Japan, all my classes except physical education are were required courses, not elective ones.

I used to skip some classes when I was a freshman thanks to boring subjects which are like fundamental sciences.

But I scored well in on the mid-term exams and term final exams with helping by from my kind friends.

Boston university, where I studied English language, has exploited uses electric tools for running many things such as the registration of the classes class registrations, the admissions of the students, and payment of tuition fees.

"Admissions" is a common way of saying "student admissions".

Because I have never experienced it in Japan, although some big universities has may use the same method in Japan, although.

Or
"I have never experienced it in Japan. Some big universities may use the same method, though."

I think in the middle of a sentence we say "although". At the end of a sentence we say ", though".

When I was a university student in Japan, my classes except physical education are required course, not elective one.

I agree with Acire