The old midterm 2 exams do not cover exactly the same parts of the course that we covered. 
Mostly it is that some of the exams cover eigenvalues which we have not done yet 
and some do not cover determinants that we have done. 
I made some quick comments here, for each exam, 
what is missing and what are things we have not covered.

mid2f01-good-skip eigenvalues #1,                              
mid2f05-does not cover enough,skip eigenvalues #4,5                                
mid2s06-does not cover enough-skip eigenvalues #4,10-15,
mid2f06-does not cover enough, 
mid2s07-does not cover enough,
mid2s09-does not cover orthogonality, 
mid2s10-does not cover determinants, 
mid2s11-good but does not cover determinants,
mid2s13-does not cover determinants,
mid2f13-does not cover -skip eigenvalues #4,
mid2s14-good but does not cover enough,
mid2f14-good skip eigenvalues #4d,5,
mid2f15-does not cover enough,
mid2s16-does not cover orthogonality, 
mid2f16-does not cover enough-skip eigenvalues #2,
mid2s17-does not cover determinants,