For students, the certificates obtained in the university are CET-4, CET-6, CET-2 and CET-3. These are the most fundamental!
Mechanical professional certificate in the university if you are particularly interested in can take an examination of:
1:auto CAD, CAXA two-dimensional common drawing software. Personally recommend CAD!
2.PROE, SOLIWORKS and UG are commonly used three-dimensional mechanical software. Has its own characteristics. Look at your own hobbies!
3.Matlab, mathmatic and other commonly used mathematical numerical calculations. Hungry, not very clear, don't talk nonsense!
You can also find other software!
These are not difficult to master through self-study. As for the exam, I'm not sure.