It may be good to talk to your son about his practice partner. If he is getting handled most of the time, it can be frustrating, but it usually makes his own opponents seem much less threatening. Make sure to point out the improvement you see.
My son was lucky enough to have one of the best partners anyone could hope for in his first two years of high school, both as a wrestler and as a person. His partner graduated as a 2x state champ and is now wrestling at a great college with a demanding curriculum. My son was very fortunate to have this opportunity and he did benefit from it.
There's no shame in getting handled at practice if you're outmatched, but still giving your all. It can be discouraging and frustrating, but try to point out the benefits and make sure you tell him when you notice the improvement.
Good luck to your son the rest of the season!