Exeter's next game is away to Saracens. A bonus point defeat would be a good result there, and would take them to 60. Final game at home to Sale. Bonus point win possible, taking them to 65, with 13 wins
Wasps are at home to Leicester, then away to London Irish. Two wins without bonus points would take them to 65, with 13 wins.
If two sides end up level on points, their positions are determined by the number of wins. If they're equal on wins, it's down to points difference. At the moment, Exeter are +194, Wasps +150.
If Wasps beat Leicester, it'll all come down to the final day and Leicester would be the most likely to miss out, as their final game is at home to Northampton.
Leicester are currently on 60 points, with 13 wins and a points difference of +19. They have scored 32 tries, only five more than London Welsh. Wasps are the top tryscorers in the Premiership with 72. They have won their last six home games against Leicester, including a bonus point win.
All to play for. Exeter probably have a slight advantage, but not really enough to say that they're in the driving seat. If they get nothing from the game at Saracens, Wasps probably have the edge - provided they win their last two games.