You are having a misconception,you cannot directly do MCA after completing your Diploma course or after 12Th,because Diploma is not considered as a Graduation level course,so you must have to do a Graduation level course after Diploma course in order to become eligible for MCA.
List of Graduation courses available for you after Diploma course:
Even though you have good choices of courses,but I will recommend you to go for Engineering degree courses after completing your Diploma course,because after your Diploma course,you will not face any difficulty in Engineering degree as you had studied all the important subjects of Engineering in your Diploma course.Moreover you will directly get admission in 2nd year of Engineering on the basis of your Diploma course under Lateral entry scheme.
Eligibility for Lateral entry admission mode:
- You must have completed your Diploma course with minimum 60% marks in Engineering from a recognized State Board of Technical Education.
- You must not have any backlog left in Diploma course.
- Your age must not be more than 28 years.
Most prestigious Engineering Colleges offering Lateral entry admissions are:
Thapar Institute of Engineering and Technology,Patiala.
Guru Gobind Singh IP University,Delhi.
Sant Longoval Institute of Engineering and Technology,Sangrur.
Harcourt Butler Technological Institute,Kanpur.
Guru Tegh Bahadur Institute of Technology,Delhi
Amity School of Engineering and Technology,Noida
Guru Nanak Dev Engineering College,Ludhiana
DAV Institute of Engineering and Technology,Jallandhar.
SBS College of Engineering and Technology,Ferozepur.
Chandigarh Group of Colleges,Chandigarh.
So,after completing your Engineering which is a Graduation degree you will be eligible for MCA which is a PG degree,there is no age limit for MCA admission.
All the best.