Don't make a decision when you hear it. Everyone is doing everything, and there are success or failure cases. So, the first thing is to set goals.
Postgraduate entrance examination can be taken in the fourth year of school, and so can civil servants. As for MBA, it is best to work for a few years before studying, otherwise it is of little significance.
It is suggested to study your current major first and do your current study well. There will be a choice then. Don't talk about anything else if you can't learn well. Postgraduate entrance examination, going abroad and reading MBA should be basic.