graduate in any subject is the basic requirement for the admission in the MCA courses. But the required marks in graduation may vary from college to college.Most of the institutes require 45 to 50 % aggregate in qualifying exam for taking admission. Reserved categories get some relaxation in aggregate percentage.

apart from the above mentioned, one must have studied mathematics in class 12th.

here is the list of some of the entrance tests for the mca admission purpose

• IPUCET- Conducted by GGSIP University for admission to university and its affiliated colleges in Delhi.
• TANCET- Conducted by Anna University for admission to university campus and other colleges in Tamil Nadu. 
• NIMCET- NIMCET is NIT MCA Common Entrance test, a National Level Test conducted by NITs for admission in to their MCA programs.
• BIT MCA Entrance Test- Conducted by BIT Mesra for admissions to its MCA program.
• WBJEE- Conducted by West Bengal Joint Entrance Exam Board for admission in all technical institutes of West Bengal
• UPSEE- Conducted by Dr. APJ Abdul Kalam University (Formerly UPTU) for admissions to various colleges in Uttar Pradesh.

coming to the mtech admission one must have completed BTech in science or technology

and if studied honors subject like physics biology and chemistry than it is required to have completed masters in science to make oneself eligible for mtech in the concerned subject

and for admission in Mtech you need to crack GATE exam 

There is no upper age limits ,however, minimum age limit is 21 years.Also, you can attempt this exam as much as possible.
hence is the details of gate you can also check our website for further details