[POLY] Possible to be rejected from diploma course because I didn’t do well in A levels?

I didn’t do well in A levels AT ALL, so I’m thinking of taking a diploma (specifically in NAFA). I know that they will only look at my O level score but should I be worried that they might ask me why I didn’t do well in A levels and hence potentially reject me? I’m afraid during the interview they might see that I did A levels too and then ask why I didn’t do well then I come up with a (potentially invalid) reason and then maybe because of that they think I’m a lazy or lack resilience or idk and hence reject me. Am I thinking too much? Should I be worried LOL