yes. Rosaryhill is a co-ed school. I almost forgot Rosaryhill tim
St. Jo is a government-aid primary school which can be entered thru the marking system at the first round and by lucky draw in the second round. There is no relationship with any kindergarten.
One more thing. If your target school is not within walking distance, you'll have to check whether any school bus route / nanny bus that covers the areas where you live. Good Luck!