Correction of the Writing errors in this text.

[Aysl]

let me know which and where writing errors have in this short text.
When I was studying at the university I worked very hard for passing my exams. I used to go to the main library for studying every evening after lessons At the weekends, I sometimes studied with a friend, Ali.
Ali was a hard-working student too, but he had to work partime for helping paying for his living expenses. His parents sent him an allowance every month, but it wasn't enough for living.
Ali worked nights in the local Chinese take-away on Saturdays, so he was always too tired for studying on Sunday mornings with me. He slept until late Sunday afternoon, but I used to get up at 10 a.m., go to the gym for keeping fit, then do a few hours studying at the library.

[Yankee]

Please let me know which and where writing errors have occur in this short text.
When I was studying at the university, I worked very hard for at passing my exams. I used to go to the main library for studying to study every evening after lessons. At the On weekends, I sometimes studied with a friend, Ali.
Ali was a hard-working student too, but he had to work part time for helping paying for his living expenses. His parents sent him an allowance every month, but it wasn't enough for living.
Ali worked nights in the local Chinese take-away on Saturdays, so he was always too tired for studying on Sunday mornings with me. He slept until late Sunday afternoon, but I used to get up at 10 a.m., go to the gym for keeping fit, then do a few hours studying at the library.

Minor fixes.

[emsr2d2]

In BrE, it's "at weekends". The article is not required, but we don't use "on weekends", which is AmE.

[Aysl]

In BrE, it's "at weekends". The article is not required, but we don't use "on weekends", which is AmE.

Do you have any corrections for this part, please? "Ali worked nights in the local Chinese take-away on Saturdays, so he was always too tired for studying on Sunday mornings with me. He slept until late Sunday afternoon, but I used to get up at 10 a.m., go to the gym for keeping fit, then do a few hours studying at the library."

[alpacinoutd]

Here's how I'd write it:

Ali worked the Saturday nights at a local Chinese takeaway, so he was always too tired on Sunday mornings to study with me. He would sleep until late Sunday afternoon, but I would get up at 10 a.m., go to the gym to keep in good shape, then spend a few hours studying at the library.

[tedmc]

Here's how I'd write it:

Ali worked the Saturday nights at a local Chinese takeaway, so he was always too tired on Sunday mornings to study with me. He would sleep until late Sunday afternoon, but I would get up at 10 a.m., go to the gym to keep in good shape, then spend a few hours studying at the library.

I am not sure about having "the" there. I would either delete it or use "on".

Also:
...he had to work part-time to help pay his living expenses...

[emsr2d2]

I am sure sure about having "the" there.

Tedmc, you will want to correct your type in the previous post.

[Maybo]

but he had to work part time for helping paying for his living

Is "help" a noun after correction?

[Charlie Bernstein]

Do you have any corrections for this part, please? "Ali worked Saturday nights at the local Chinese take-away on Saturdays, so he was always too tired to study with me on Sunday mornings with me. He slept until late Sunday afternoon, but I used to get up at 10 a.m., go to the gym to keep fit, and then do a few hours of studying at the library."

There!