If i will get a discount on a college course cos on job seekers can I enroll without paying?

I am supposed to enroll on a course at a reduced rate cos I am on job seekers, am I allowed to just enroll then pay the money later? I ask this cos I want to enroll on my last day of job seekers then start work the next day. Can you enroll and pay a small amount then pay the rest later at the reduced rate. Can you also pull out of the course before paying the second payment?