May I ask if a person on a work visa can read part-time

I'm graduating from business now and I don't feel like I'm going to get enough points when I apply for immigration in the future, so I'm thinking about whether to read 7. But time and money may not be enough.
So want to ask the forum's big man, take a work visa people can go to work while reading, they also do not often go to school, the end of the semester to complete the paper through can get a higher level