Top investment banker at a top investment bank you'll
need:
At least a degree from an Ivy league or a school of an equivalent
standard, and then some.
An IQ of 160, technically you'll need to be a genius.
Lots and lots and lots of connections
Drive and willpower; you'll work 60-100 hours per week almost all
year round.
The path:
Good college, not only for the prestige but also for networking
purposes.
Be prepared to work in the back office as an analyst/associate for
3-5 years until you get your CFA/MBA.
If you're lucky you might get into front office trading (top 1%),
if not you're stuck in middle office.
Basically the top big name bankers are the cream of the crop, maybe
only the top 1%. Good luck.