What if the subject you want to take is not being offered when you want to start?
You will still have the flexibility that has been associated with SATS. If for example, you want to register for a subject, that is being offered in the 1st of May to 30th of July term, but you want to start on the 15th of March, you can register early for the subject, and begin working on your assignments immediately. You will in effect, have a six-week head start on the course. You may submit your assignments early (as soon as you are ready), in which case you may have to wait a little longer to receive your marked assignment. However, nothing prevents you from starting a course that is only being offered in the next semester.
Take note that subjects can be activated approximately two months prior to the starting date of the term in which the subjects are presented.