20 credits for Maryknoll is not safe at all. 25 credits should be secure, but 20 credits is just by luck! I am a Maryknoll graduate, but since my daughter is not a Catholic, I also got 20 credits only, and I didnt make it as well in 2nd round. But since i am an old gal, I do have referral to principal, so finally made it thru the 3rd round interview. But its not easy to be success too, since all the list of candidates in 3rd round are either daughters of old gals (like my case), or have referral from school management/sisters.
But up to this stage, the principal is fair, the performance of the girls will be most essential.