That all depends on your financial situation. If you have Daddy Warbucks funding your education, living expenses and extra curricular activities with no obligation to re-pay it would not be necessary to have a summer job.
Most students living a "hard-knock-life" must work.
No
No, it's not compulsory nor required
No, but its good to earn some money for yourself :) extra cash is never bad :p
no
Not at all
No, you don't need to
no
No, but it is generally a good idea, since being a university student costs quite a bit of money, and the amount of hours you can work while attending school is limited.
no
The answer is no because summer is a break, not a station
No, of course not
No