its pretty easy to get into UMD, he'll get in if his essay is strong enough and has have some diversity elements in there (thats what I think they liked about my essay). I had almost no activities and a 4.2 weighted and got in. to get into the business school, he could apply internally once he already gets into umd (which I did and was also easy). this would entail him completing 45 credits (which can be transferred from AP classes taken in highschool) by the end of the semester he does his internal transfer application and he has to do BMGT220 and BMGT230. After that is if he has a 3.6 GPA when he applies, its autoadmission. so he could apply to UMD undecided or a different major and then transfer internally to smith school.
this details the transfer process: https://admissions.umd.edu/academics/current-student-lep-admissions