Check
this out (side note: jfc Apple, way to proliferate the number of chip variants). About 2/3's of the way down there is a bar graph, for non-intense workloads (Word, Excel, email, etc) the "geekbench 6 single core" tab (the middle one) is basically the one that matters. (Some things benefit from multicore but not as many as you would hope - mostly multimedia stuff). The M3 is a good chunk faster than an M2.
The M2 is in both the 13" MacBook Air (2022) and the 15" MacBook Air (2023). The 2024 MacBook Air (
announced in March) laptops have M3 processors (both 13 and 15 sizes). Note that Apple has educational discounts for current models, not sure how you get them (university bookstore?) so maybe check into that. A 13" Air M3 is supposed to be $999 starting price for educational buyers ($1199 for 15").
You might be able to find some clearance/discounts on the 2022/2023 models at bestbuy/etc but unless it's an absolutely smoking deal I would think the M3 ones would be the way to go and should last through 4+ years of school.
I am personally a fan of the MacBook Air form factor as it's nice and light. Unless someone needs the extra power from a MacBook Pro, the Airs seem like a slam dunk to me.