Erm.... Have you considered University of Malaya's Backdoor?

Sarjana Muda Sains Komputer (Kejuruteraan Perisian)
Bachelor of Computer Science (Software Engineering)

Sarjana Muda Sains Komputer (Kepintaran Buatan)
Bachelor of Computer Science (Artificial Intelligence)

https://www.umcced.edu.my/programme/satu

Also what type of High School / Diploma degree you're currently holding?

Yes you can apply through front door via UPU Online.

Government IPTA accept both Diploma from Private and Public Degree.
Please use this as your full advantage as they normally accept Diploma students rather than those in PREU.

If your CGPA isn't that bad got above 3 out of 4. I think you can try apply.

I think you better make a call to UPUOnline to check your options.
Is your CGPA good?

Well other local malaysian unis are technically okay as well.

To be very frank with you lah, you enter IPTS, you sometimes realize things are actually quite shitty compared to IPTA.
Also you will notice the diversity issue where you might get sick and tired seeing the same people every day.

As long you grades meets the requirements. I think should be fine.
Most IPTS charge this price for registration fees.

diploma should have math modules to substitute this subject...?
check with enrollment admin officers