Are you sure you cannot work at all? As far as I concern, you can go and apply for the work but when they call and ask you to report duty, you should be ready to resign from your current job, and most of the time almost immediately. Speaking from experience, most of my friends wait for almost 1 year for the call and some of them even get released by JPA because there was no vacancy after 1 year. If you ask the officer, some of them will say that you can work with other company but be smart. Dont let them know.

yup. agree. engineering is not consider as critical course. most of my friends who did an engineering course released by JPA.