B.Com

Hi Vanrajsinh,
You can study PG Diploma after B.Com. Doing an undergraduate Diploma after B.Com will not be accepted, even if a college does accept you, you won't be granted a visa.

You need to have 99.99 to 97.99 with maths may work for a general category student.

You can get an accounting job but for better options, you can pursue PG Diploma in the field of your choice.

If you are interested in entrepreneurship, then you should go for BBA because in BBA, you will learn about entrepreneurship basics and later, you can do MBA.

Hi,
For getting admission in IIMs your graduation score should be 60% or above.
CAT score of IIMs closes at 99 percentile itself.
But IIM, Indore and Raipur as tracked in last two academic years take students scoring 96 percentile as well.
It depends on the availability as well.
It is better to target IIM, Lucknow.
Score above 99.4percentile.

Travel and tourism is fine. Ultimately your choice matters a lot. There are job opportunities in industry too but travel and tourism is better. Both have good scope.