The most important: Chapter 8: Derivation rules of partial derivative and total differential, multivariate composite function and implicit function.
Chapter 9 Calculation Method of Double Integral
Chapter 10 discusses the curve integral of arc length, the curve integral of coordinates, Green's formula and its application.
Chapter 11: The concept and properties of constant term series, and the trial and error method of constant term series and power series.
Chapter XII Differential Equation, Homogeneous Equation, First-order Linear Differential Equation, Total Differential Equation with Separable Variables (Considering the tight time before the exam, you can focus on what I said, just look at the formula and do an example to do well in the exam).
The following are secondary priorities:
Chapter 8: Geometric application of differential calculus of multivariate functions (give one or two examples, the teacher will probably choose), directional derivative and gradient.
Chapter 9 Application of Double Integral (This is also very important, but double integral is the foundation, so I classify it as the most important).
Chapter 10 Gauss Formula of Surface Integral and Area
Chapter 11 Power Series
Chapter 12 Higher Order Linear Differential Equations
Review well, the teacher won't have any difficulty in the exam.