I would probably recommend that 1) You get him to do Figure 8's /do counter clockwise & clockwise circuits 2) Let him get gradually lower if feeling confident enough 3) Mock landings just like you said 4) Take-Offs 5) If progressing well enough, let land. This is how I was taught, and I guess different people learn at different rates so it may be a bit different for your son. Like Scar said, the Trim tabs thing is not a bad idea. Just keep supporting him & teach him what you know and he'll do find. Good Luck !

TF96