My school is teaching Trig, network and business, but im thinking of doing others. However, the only problem i will face is learning and using the CAS calculator. Which modules are not require the use of the CAS calc?
With the time limit in the exam, I believe it would be more of a benefit to exploit all the functions of a CAS calculator rather than avoid it. The reason is because when the exam is written, the examiners expect you to use the calculator so if you don't use the capabilities of the calculator, you'd be disadvantaging yourself.
Having said that, if you don't feel confident with using a CAS calculator there is still time to improve and build upon that. I did Geometry and Trigonometry, Networks, Graphs & Relations and Matrices. I can tell you that for all 4 modules I used the calculator a lot.

P.S. Why 4 modules? Because I swapped modules in each exam.