Career

As far as I know,Indian colleges don't offer this option,but you can verify.You can do math statstics of you want to be a researcher.Other option is that you take up psychology hons as there are many research options available.
Third option is to do 12th from Open university with Science stream but you will waste at least one year in that case.

There is no height requirement to do Aeronautical Engineering.

Unless you want to make career in Accountacy & Finance only by doing M.Com, it is recommended that you do MBA to have multiple career options. Currently MBA with finance certification is very good career option.

Actuarial Science

YES U CAN CERTAINLY GO FOR B.VOC AGRICULTURE . YOU CAN DO IT FROM KHALSA COLLEGE PATIALA , TATA INSTITUTE OF SOCIAL SCIENCES ( INDORE , WEST BENGAL , GUWAHATI HUB )

No you have to do bachlors degree in Science

There are no pros and cons as such. People generally go for distance graduation if they are pursuing any professional certification like you are doing. CS has a wide scope as a statutory designation and also if you prepare for CS, your subjects of B'com get covered into its scope. Therefore I believe it is good to go for it and make your career successful. Wish you s bright future.

u can do B.Sc hons,engineering or B pharmacy and many more.