With mechanical engineering most universities having specific experiences generally doesn’t make a great deal of difference in admissions as so much of this is around what opportunity & resources are available to individuals. Additionally mechanical engineering on a national level is not excessively over subscribed to, thus grades are the primary driver of university admissions. Best thing you can do to keep as many university options open is have excellent grades.
If you are interested in engineering skills, then you could teach yourself some programming like python or matlab. There are also some free professional engineering journals available online.