How does the NUS admission system work?

Hi! I recently got into NUS CHS. I got the acceptance letter today. But I also applied for Math + CS Double Major Programme. Is that programme under the acceptance I already got? If it’s not, does it mean I didn’t get in? Since I already have an offer from CHS will they stop considering me for DMP?

On another note, when we are declaring majors for CHS, is there a quota for each major? What happens if a major is oversubscribed?

Any advice from seniors will be appreciated! Thank you!