On a roundabout you give way to traffic coming from your right (and to anyone already on it), then join when there's a safe gap.
Always check road markings and signs on approach — they can override the general rule.
Give way to traffic already on the roundabout and to anyone approaching from your immediate right, unless signs or markings say otherwise. Keep moving if it's clear — don't stop on the roundabout. Watch for cyclists and motorcyclists, who may stay in the left lane even when going all the way round.
Treat them like normal roundabouts: give way to the right, and go fully around the central marking. They're smaller, so everything happens faster — signal clearly and watch others' intentions.
Follow the lane markings, which often guide you into the correct lane for your exit. Stay in your lane around the roundabout and don't change lanes unless markings allow.
Roundabout questions sit under several topics. Try a mock test or revise rules of the road.