The job training courses are useful and not a waste of time, but it depends on the course you take..try to take more practical or lively courses which will help to get a job more easier while studying. So you can earn and study.
Of course, Job training courses are very helpful to pursue a good career. I have completed my degree and currently, I am doing a UX design course in Dubai. Students and graduates of the MMC programs typically work as: Journalists Public Relations Specialists Corporate Communications Executives Filmmakers Researchers Writers Academics Starting your career in any of these areas without specialized training will be more difficult.