Hey there!
I had a 6th generation ipad and the first gen Apple Pencil in undergrad. Loved it so much. Had my best gpa year during the year I used it (senior year only). With that said, you really can’t go wrong Bc whatever you get will help you organize even more than you realize. I worked a lot during my gap year, so I decided to splurge and upgrade to the IPad Pro and 2nd gen Apple Pencil. Incoming ms1, so haven’t gotten to use it in class yet, but it is honestly almost overwhelmingly big, but I also got the 12.9” Version. I’m not familiar with the IPad Air, but my personal advice would be to get just a normal sized iPad. That way you can splurge a bit more on more memory and get a keyboard. I also recommend the Apple Pencil 2, it’s like a $25 increase in price, but I can actually tell a difference between it and the 1st gen, 2nd gen is more smooth it feels like. Whatever you do, use the note-taking app NOTABILITY. It’s incredible. Good luck! Let me know if there’s anything else I can answer.