For endgame practice using Fritz, get a copy of "Pandolfini's endgame course", and enter the diagrams in Fritz without looking at the solution (you could do that for him, and save the positions in a database). To practice, play the winning (or drawing) side against Fritz, setting it at 3-10 seconds fixed time per move. First try to find a solution without looking at the explanation, with a maximum of about 30 minutes. After that, read the explanation in the book and try it against Fritz. Keep repeating until they're easy.