How does Uni admission work?

I read online that NTU offers full time courses and the requirement for full time polytechnic students is a diploma with merit. Basically the 10% in your cohort for your partially course.

By that logic, if someone graduated with a diploma with merit in rp/tp/sp/nyp/np, he or she can apply for ntu food science and technology course.

Does your diploma need to be related to that course in university, for example I took an art diploma in republic poly and want to apply for a science course in…