Hello dear,
In my engineering day ...in a single semester we have 2 exam(mid semester) and then final semester exam...
Attending the mid semester is compulsory...the mid semester are taken by after one and half month..it is just an practice test by which your skills will be tested...so maximum marks are depends upon the college..
Hope this helps you better way!!!!

Hello Tanuj,
In every six months, you have to give an end term exam. And before End Term exam, you have to give  2 or 3 mid term exam. Some college also conduct pre university test before End Term Examination. Total marks and evaluation pattern may vary according to college and university. If you study normally then you can easily pass it. Just focus on your weak portion.
Good Luck.