Here is the situation.
My colleague, T1000 recently quit his job as a shop assistant.
He is cool but nice. He was doing a part-time degree in a university.
He told us that his school assignment had become harder and heavier, so he wanted to quit the job.
Now, in my diary, I am writing this:
T1000 has quit the job so that he can focus on his school work and thesis.
I am not sure whether it is correct to write "someone wants to focus on their something"?
If it is not correct, can you suggest some other way of saying it?