You can train the same drill 6x (or 5x when you did not unlock the last drill) it is no problem.
Also you should first focus on unlocking all the drills and get your training level up before you start power training, it will make you more versatile in planning and save you rests when the drills are higher level. As long as you didn't unlock all or most of the drills, I would stay away from training single players specifically and save rests, buy normal older players in auctions...