Science

You need to be a B.Sc-Psychiatry student or have equivalent examination with a minimum of 55% and above from a recognized university, if you want to do M.Sc in psychiatry.

Yes, you can edit, during the correction time.

No, your percentage is too low so you won't get any seat for B.Sc(Hons.) Try for some other courses. The cutoff is hardly 75 so your percentage is too low. You don't even have 1st division so not a chance. Nowadays, 60% for honors is mandatory, so I recommend you to give improvement of 12th and score high percentage so that you can get a seat in some good college and with your own subject selection or go for entrance test so that the percentage doesn't matter.
Good Luck.

Can you please specify the name of the college where you wish to apply?

No, you need to complete Bachelor's degree through distance, then only you can opt for Masters through distance.

According to me, M.Sc in forensic Science has better scope, better salary and is more in demand. Very soon, the scope will go wider as the government has approved, to open some more forensic labs throughout India.

You need to contact the college authorities for the same. Some colleges do accept lateral entry, but there is a different procedure for every college.

M.Sc. In criminology is not offered in IGNOU.

You can refer the mentioned link to know more:https://www.shiksha.com/university/andhra-university-visakhapatnam/aucet-exam?course=453