short answer: no.

it depends on the nature of the job. if you are employed to secure a network, why do you need event management skills?

imo certifications are useless unless needed for the job.

perhaps you can aim for analyst or consultant role as your career in IT security. There are many employers looking for skilled labour aka cheap labour. since you are a poly grad, my advice is to get a good gpa to enter uni. or study for a degree part time. In sg if you have a degree your future will be more comfortable.