Coming back to italki!

(예은さんの訂正は正しいですが、ぼくも英語を少し変わってあげると思います！)

During my absense from italki, I've decided the university that I want to go to (in the future)! [<-将来のことです。] 

I'm a 10th greade student now which means that I have about 2 more years to study for the university's entrance exams. 
Lately I'm studying hard in order to fulfill my dream / so that I can reach my goal.

いいね！一所懸命勉強しなければなりませんね！英語もすごかったです。ところで、あなたが選べた大学の名前は何ですか？これからも頑張ってくださいね。

m(^ ^)m

Coming back to italki!

During my absense from italki,_I decided the university I want to enter!
I'm a 10th grede grade student now,it means meaning that I have about 2 years to study for the universitys' university's entrance exams.
Lately I'm studying hard to achieve themy hopeDream.

Optional (Sounds more natural)

Corrected

Good luck achieving your goal!

Original

coming back to italki!

During my absense from italki,I decided the university I want to enter!
I'm 10th grede student now,it means that I have about 2 years to study for universitys' entrance exams.
Lately I'm studying hard to achieve the hope.

Corrections

Coming back to italki!

During my absense from italki, I have chosen the university, I want to enter!
Currently I'm a 10th grade student, which means that I have around 2 years to prepare for university's entrance exams.
Lately I'm studying very hard to pursue my dream university. 

P.S.
Wish you all the best in applying to university! Never give up.