Depends. How low is your ''not too well" in terms of CGPA? 3.5? 3? 2 point something?

Generally, if your CGPA is 2.75 and above, it's still possible for you to get into public unis, as long as you're not picky. UMT, UMK, UMS, UNIMAS etc would still consider you. No harm trying.

If your CGPA is 3-3.5, it is possible for you to get into a better university, but less competitive courses (such as the social science and applied arts variety, maybe except stuff like econs, management, accounting etc which is usually filled with high scorers). If you apply and are accepted for interviews, put your best foot forward, as in interviews your academics isn't the only thing taken into account - your presentation skills, passion etc can give you an edge over that kid with a 3.8 CGPA but has no idea what he wants to do.

All else failing, then you can opt for private colleges and universities...

In either scenario, getting a low STPM score isn't the end of the world. Relax your choices (don't go for comptitive courses unless you absolutely will die studying them) and work hard in your first year of college or uni - it's not impossible for a meager 3 pointer in STPM to get a Dean's List (>3.5) result which then can be used to apply for scholarships (only applicable in your first two years though), or graduate with 1st class (3.75 and above) and convert your PTPTN loan into a scholarship.

Source: Personal experience as well as that of close friends. I scored a mere 3.25 in my STPM but am in a course that I love, in a reputable public uni, and am still a dean lister (as of today). Feel free to PM me if you need anymore help.