The first task I think will go in order of Kun, Revan, and then Yoda. Yoda may have some difficulty taking the spear, and without the force, I'd have to say he will not be able to move very fast.. Kun, of course, is expertly conditioned, a fearsome physical specimen and capable with weapons, especially since he is able to create his own lightsaber style that leaves very few survivers. Revan is a wildcard, we don't know about his lightsaber prowess, so we can't guage his ability with most weapons and coordination. I suspect though, that he isn't 900 years old and doesn't use a cane to walk, so he'd finish second.
1) Exar
2) Revan
3) Yoda
The second task I have to agree with Faunus. Exar has sheer intimidation and a flair for getting exactly what he wants. He was subtle enough to go under the noses of the Jedi, even when there were thousands of them, and was only defeated when he was betrayed and they sent thousands upon thousands of forces against him. Exar will be able to weasel out the cheats. Revan is cunning, but I think Yoda has a greater ability to "read" people than he does. Yoda has trained presumably, hundreds of padawans, if not thousands, in his long career. He has seen and has experience with all different kinds of people. Wizened by time, he knows what is what.
1) Exar
2a) Yoda
2b) Revan
In the third task, Exar completes the sweep. He knows Ulic, he was proclaimed master. And at his peak (which I'm assuming we're taking all three at their highpoint), Exar was a straight up fearsome lightsaber duelist. Exar dices up Ulic. Yoda is deceptive. He's simply so quick and acrobatic, that it's very difficult to defend against him. He will simply find a chink in Ulic's armor, and take him apart. Followed quickly by Revan, who finishes off the Sith apprentice. Revan has knowledge and battle training, he can likely defeat someone like Ulic, however, he does not have as much lightsaber to lightsaber experience as someone like Kun, who has defeated so many Jedi, it's not even funny any more. Revan is more methodical, in many cases, it would help. But against Yoda and Exar, who are speed killers, he will be the low man.
Final Order:
1) Kun
2) Yoda
3) Revan
Yoda is close to Revan, but I can't see Revan having the advantage here.