Centre for Development of Advanced Computing

Yes, You can do Diploma courses after 10th. There are a lot of diploma courses in the market for the professional carrier and could help in your professional carrier.
You can do Three year polytechnic diploma from any branch which will be equivalent to 12 std and help you to find out a job after that you can do your graduation on your salary.
When you are doing the three year diploma on same time you should do some job oriented diploma courses so that they can help you to find the job.
You need to compare the fee of diploma courses because your diploma will have same value but fee will differ. you can check out various institutes and courses on
Certification Training Institute | .Net Training Institute | PHP Training Institute | Trainings in Noida
and can go with the suitable institute.

You can't do a post graduation from C-DAC with a 3 year B.Sc under graduation. You can directly inquire with them if they would let you in based on your performance. They need a 4 year under graduation qualification.
Check the brochure and advertisement for eligibility criteria. CDAC is very responsive in answering queries from prospective students.
However, if you have a four year degree, you can opt for DAC, DITISS, DSSD, DiWIMC
PG Diploma in Advanced Computing (PG-DAC)
PG Diploma in IT Infrastructure, Systems and Security (PG-DITISS)
PG Diploma in System Software Development (PG-DSSD)
PG Diploma in Wireless and Mobile Computing(PG-VDiWIMC)
Also, choose your centre wisely as it depends a lot on which centre you choose. Remember: ACTS- Advanced Computing & Training Schools are the actual CDAC campuses and hence, provide high percentage of placements.