In terms 2 & 3, Auckland Schools Cycling (ASC) runs a series of team time trials (TTT) and a points race under College Sport.
This is great if you're at a school that has a strong cycling programme, so you can have a team of 4 (junior) or 5 (senior) riders of similar ability to ride the TTT's.
If not, you can enter by partnering with other schools. That's what Jona is doing this year, joining in with Selwyn and Glendowie colleges.
There are no college sport road races unfortunately (although ASC runs the iBuilt tour, that's open to any juniors), so if you can't get a team together you can only do the points race.