If you have an idea of what applications need to be run at school, you can get an idea of how powerful the machine should be.
Asus makes the Dell machines. Take a look at Asus laptops.
Check this list: https://www.tomsguide.com/best-picks/the-best-windows-laptops
In prior years intel had better chips than amd. Not sure the relationship now.
Choosing a SSD hard drive will keep things fast.
Good luck!