Barry has grades based largely on exams (as well as quizzes in some classes) during the first year. Per the handbook, professors can also base the grade on papers, presentations, or even attendance as they see fit, but even the profs who do utilize that option typically just make that stuff optional extra credit (maybe 1-5%).
The clinical 2nd and 3rd year courses are where you will typically have to give PowerPoints that are worth a small fraction of your grade in each course. The main point of that is just to give the students practice with reading journals and public speaking; that helps you prep for subsequent clerkships, most or all of which will require a student PPT to the residents+director.
As for computer equipment reqs, your school should have labs available with computers, printers, scanner, etc (all you really need is a jump drive). Personally, I didn't have a laptop until near the end of 3rd year, and even when I got one, I barely ever brought it to classes. I did just fine. You will probably benefit from a laptop for your clerkships, though.