As far as I am aware, you need not worry about your SAGE running out. If you are learning with a training provider you can email them in advance of your SAGE licence running out. They will then send a new CD.
With regards to the exams mentioned, these are all work/home based exams and the use of SAGE is required for the computerised sections, where applicable. You will however not require SAGE for the BA7 Exam as it is centre-based.
All the best!