Can you study at a university if dont have matric?

No, you generally cannot study at a university without a matriculation certificate (or its equivalent). A matric certificate (or high school diploma/GED) demonstrates that you have completed the necessary secondary education to meet the minimum entry requirements for university studies. Universities require this proof of successful completion of secondary education before they will admit a student. There may be very rare exceptions, such as mature age entry programs or specific alternative pathways, but these are not common and usually require extensive evidence of readiness for university-level study.