Air carrier pilot reported an unstabilized approach.

Narrative

We were on the ILS to 02. Approach was going well until passing through 500 ft. the First Officer (FO) got high on the glideslope and went almost 2 dots high and then pitched down to correct. I called out 2 dots high and then with the pitch down it went below glideslope and GPWS said 'Sinkrate'! Both I and the relief pilot called it out and I followed with 'Go-Around! FO performed the go- around and we climbed to an assigned altitude of 4000 ft. FO leveled at 4000 and attempted to engage the Autopilot. It didn't engage and we lost altitude and I called 'altitude-climb now'. He arrested descent at 3750 ft. and climbed back to 4000 ft. He forgot to engage a pitch mode (FL change or VNAV) corrected his mistake and the Autopilot engaged and we completed a successful approach and landing.Anytime you fly into OGG it is a challenge. 7000 ft. runway; gusty winds; terrain; you have to get it right. I wouldn't go so far as to make it a [special] city; it is still a very challenging approach and landing. And when it becomes unstable you go around and try it again if feasible.I think FO's do not get a chance to fly the leg to OGG much-I suspect Captains usually take it. FO's need to be given the opportunity to fly it and build the experience.