Why does a student have to take part time job?

Answer;

To fulfill his/her living expenses
Discussion:
For some students, getting a job while they are still in high school is not an option. Working seems to be a necessity for them, as they might not get any help from their parents to pay for tuition or for living 
expenses. Therefore, they may not have any other choices but to accept a part-time job. However, working is not only option if there are some better alternatives to help them.
What does the text tell us about?
The ways how the students get necessary funds
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