keep someone or something on (the) (right) track
Fig. to make sure that someone or some process continues to progress properly. You have to watch him and keep him on the right track. I will do what I can to keep the process on the track.
keep on (the) track
Fig. to stay on the path that one is on; to continue doing the things one is doing. Keep on the track and you will end up where you want to be. I know I can keep on track.