Deadline for Graduation Thesis

At the university where I work, today was a deadline for graduation thesis.

Students have been writing their theses all over creation for the last couple of days.

Yesterday, I had to help students' studies until late at night.

It was hell in many ways and I was exhausted.

Since the entrance gate closes during the midnight, I could not go home and I had to stay the night at my university.

Next, students will prepare for the graduation research presentation, which will be held in two weeks.

I sincerely want students to prepare for the presentation as early as possible.

卒業論文の締切

私の勤める大学では、今日が卒業論文の提出締切日でした。

学生たちはここ数日で必死に卒論を仕上げていました。

私も昨日は夜遅くまで、学生の手伝いをする必要がありました。

かなり大変で、くたびれました。

門は夜の間閉鎖されるので、帰ることができず、大学に泊まらなければなりませんでした。

次は、二週間後の研究発表会に向けて、準備をしていきます。

今後は、もっと早くから準備を進めてもらいたいと切に願います。

• Deadline for Graduation Thesis
• This sentence is perfect! No correction needed!

• At the university where I work, today was a deadline for graduation thesis.
• At the university where I work the deadline for submitting a graduation thesis expired today.

• Students have been writing their theses all over creation for the last couple of days.
• Students have been writing their theses frantically for the last couple of days.

• Yesterday, I had to help students' studies until late at night.
• Yesterday I had to help them study until late at night.

  It's not necessary to put a comma after "yesterday" but it's not a mistake either.
  
  In my opinion "helping students' studies" doesn't sound natural... But you mentioned the students in the previous sentence, so you can just say "them" and add a verb instead

• It was hell in many ways and I was exhausted.
• It was hell in many ways, and I was exhausted.

  In this sentence "and" joins two clauses, so you can use a comma here

• Since the entrance gate closes during the midnight, I could not go home and I had to stay the night at my university.
• Since the entrance gate is closed after midnight, I could not go home and I had to stay the night at my university.

• Next, students will prepare for the graduation research presentation, which will be held in two weeks.
• Next, the students will prepare for the graduate research presentation, which is due in two weeks.

• I sincerely want students to prepare for the presentation as early as possible.
• I really want students to prepare for the presentation as early as possible.