MBA/PGDM

You need to appear for one of the entrance exams like CAT, MAT, XAT and CMAT and based on your scores, you can apply for individual colleges. You can also take the UPTU entrance exams for management.
I, however, would advise you to look for some good colleges (Tier-1) like IMI New Delhi, MDI Gurgaon

Hi,
You can either download it from the internet or can purchase it from a bookshop. There are many publishers, Arihant being an example.

Yes, indeed it is good course for engineering graduates for better career prospects.

CA is chartered accountant whereas MBA is Masters of business administration. MBA degree leads you to a career in business field whereas CA leads to a career in accounts, taxation, etc.

Yes, other than CAT you can appear for MAT, XAT, CMAT, ATMA, SNAP, NMAT, etc. All have their respective official websites. Do check them from time to time, browse through MBA education portals. These exams also get published in English newspapers.

Yes, you can get admission with this score. This institute is accredited by NBA and has also got AIU approval.