Science

Hi
You can do B.Sc in bio/biotech/physics/chem/life Science/nursing/pharma
or opt for B.A. (hons) in any subject or pursue law or do a 5 year integrated MBA from IPM (excellent packages) or animation etc.

Hi,
There are many sources available. You can search them on the internet which is the best source. You can also search for books online or in stores.

Law through distance is not available. It is a full time course. Even if someone is providing any such course it will not be recognised by the BCI. You are eligible for a 3 year law course. So you can give entrance exams for GLC or take admission in a private college.

Hi,
PG exams are held every year. You can sit in those and qualify them to get admission in the course you desire.

Hi
No, you cannot do M.Tech in food tech as the requirements are completely different. There is no Masters+PhD (food proc) programme in any college as Ph.D requires clearing UGC NET exam. You should pursue M.Tech CS which will give you better packages.

Yes, you can get admission in PhD in biological science with 70% in both graduation and post graduation. You will have to clear the NET exam first.

Hi
Your degree may be valid but it may be so that the West Bengal School Service Commission does not recognize distance degree and recognizes only regular degree. For this you will have to check their website. Along with this having the requisite % is also important.