My son is now studying in P1. I noticed that there are 5 girls in each class. That means 20 in the whole form. Hope the information can help you. I think this school is a good one. The teachers certainly have high expectation on the students, but they also give enough gudiance so as to make students achieve the target.
I also think the teachers supervise the students very well and students can express themsleves. I just heard that some schools do not allow students to make noise in the classrooms and so students are not allowed to express themselves.
I have another perspective. My daughter is now studying in a girl kindergarten. I may transfer her to RC in P1.
As a father of 2 gals, I think that RC is a good one for boys but not for gals at this moment. I will change the above view if it formally announces switching to co-ed in both primary and secondary and the ratio of boys:gals is more even (say 50:50 or 60:40).