DCA

Of course, if you have math/stat. /CA/ CS in PUC according to university rules you'll get admission. It would be easy for you to understand the concepts.

Yes, in mostly states DCA is compulsory for patwari with a graduation degree from a recognised university of college.

10+2 from a recognised board of education. Career prospects like :- graphic designer, computer operator, c+ devloper, etc.

Yes, it's good but you can also opt for graduation degree along with it. You can opt for correspondence for doing it along with Diploma course. Because graduation degree is a must for great career opportunities in future. Most companies require candidates with a eligibility criteria of a graduation degree along with the skill set required for that job.

Generally, this programme imparts specialisation in the following fields:
Basics computer skills
MS Office applications
ERP basics
Internet basics
E-Business
Software hacking & IT security
PC assembly and trouble-shooting
Software engineering.

Dear student, please go through this website for more information related to your query, this will help you. https://www.shiksha.com/university/ignou-indira-gandhi-national-open-university-delhi-3030/course-post-graduate-diploma-in-computer-applications-pgdca-740305.

Tap the link below to fetch all necessary details~
https://www.shiksha.com/it-software/articles/career-opportunities-after-completing-diploma-in-computer-applications-blogId-4575.