What to do after UG?

I am currently an ug student at Christ university pursuing BBA. I have a lot of confusion in my mind whether I should go for an MBA or look for a job first. I know MBA id only worth it from Tier-1 college but is my 1 year of effort preparing of CAT/GMAT worth it? What if I learn something useful in a span of a year/ try to build something?

My end goal in life is entrepreneurship only because that’s where real wealth creation is ig. My dad has his family business but I dont want to join in directly. For that I would need to show him that in some years I can build something of my own, else my last option will to join it only.

Do you think that dedicating a year to exam preparation is worth it or should I develop some skills and try to work in some startup after college to see how businesses are built?

I know this is a long and very subjective question but would love to have your views.