University life

Hi, University life is awesome.
I'm studying in Post Telecommunication Institude Institute of Technologies
My major is Software Engineering.
There are 3 main reasons make me enjoy why I enjoy my University life.
Firstly is new studying environment. Better is: First is the new studying environment.
University is very different place than HighSchool. I have to learn more and faster. Averagely On average, I take about 7-9 subjects in a semester.
But I'm not a hard-working student at all. Sometimes I become a lazy student. Ha ha.

Secondly,
I made many friends since I entered university.
I also joined a ecomonic- Club I guess you are saying an Economics Club so I have many friends of same club as me. in the same club.
Finally. I have so many experiences. In 2012 I worked in a group project to deverlop a game in Nokia mobile. I've learned so much knowledge. It's better to say I've learned so much or I've gained so much knowledge.

That was a time I got a lot of things helpful for me. This sentence was not clear. Write something like:
That was a time when I learned a lot that was helpful for me.

Now,I like my university life because I can enjoy it in every way.

 I have to do my best for my two years to go so that I won't regret later.

Overall comments:

Your piece was very clear and easy to understand, and none of the mistakes made the meaning unclear. The corrections will make it even better. Enjoy your years in university.