<p>Yes, you need to send both transcripts. The new GC should mention how well he acclimated (academically and socially) and how he sought out- successfully took on- the new rigor. He’ll be looked at as a kid who transferred and how he adapted will matter- (in some cases, it’s a preview of how he will adapt to college.) So, if he joined activities, took on some role at the new hs, the new GC can mention that as well. Yes, you can include a supplemental LoR from the GC or a teacher at the old hs.</p>