Q:
Take a year gap or do part time study ?
I just finished a one year fast track program before continuing my degree. I would like to go working. I already had a job interviewed last week and it is a full time job. Should I do part time study? But there are only certain courses that offered part time study and most of them does not related to my course that I studied before which is engineering. Well there are some but I'm not interested. Or should I take a year gap to work and take any short courses that are available

Unless you are doing this to pay for the rest of your education, you will find returning to school later or going part time will be significantly harder.

Speaking as someone who got his first degree full-time, and the next one part time while working as I had already maxed out my student loans at the time.

You have a chance and want to work full time so do it, as practical real world experience is often worth as much a class time.