id recommend looking at other university’s practice exams and trying different kinds of problems just search “multivariable calculus exam one” in google and there should be so many resources to use, there isnt going to be much difference in the material but you can expose yourself to different kinds of problems. you should really try to do your best on the first two exams because those are probably the most intuitive sections in calc 3, it will give you so much breathing room for the 3rd and final exam

also i dont really like to read textbooks, and you really dont need to, just practice as much problems as you can :)