The content of the first test is more than that of the third test, such as curve integral and surface integral to find some geometric physical quantities (area, volume, surface area, arc length, mass, center of mass, center of mass, moment of inertia, gravity, work, flow, etc.). ).

If you take the exam on the third, you'd better use the special review materials on the third. If it is a textbook, you can cross out the content that you don't take the exam.