Doesn't matter signalling right means you are turning right it tells people you're going full circle rather than exiting. Straight ahead is left signal after you pass the last exit before yours there is no right signal about it
If you did that on your driving test would be a serious fault and you'd fail
It can never be as clear cut as that. Each layout is different, and the movement of other traffic may change the signalling at different visits.
Any signal should be given to inform others of your intentions. Care needs to be taken to avoid misleading signals.
Around Swindon we have many mini-roundabouts where signals need care. Sometimes a right signal is needed at a two exit roundabout to discourage vehicles form entering at exit one. But on some, U-turns are common, so such a signal will have oncoming traffic stopped unnecessarily. Each arrival must decide which is the best at that time, dependent on an assessment of any drivers on the left. Do they need to be told, or do they look like they'll stay put?
Some will argue that this is advanced driving techniques, but my learners have to think. I do not have a lower standard for learners. They work hard, poor things, but I'm happy to share the road with any of mine.
So there's no answer to this. Each junction is different, each time you negotiate it.
Many years ago, it was practice to always signal right if going beyond exit 1, so signal right, enter roundabout, signal left and exit at 12 o'clock. This practice was removed from the highway Code only a few years before I started driving, (early seventies), but sadly I still see some doing this. It can be confusing, but always irritating. Makes you wonder what were they thinking when the rule was introduced.