Move from back to front office is tough. You want advice? Well, start by thinking about which front office role you want to pursue. Front office isn't one department, but comprises various - investment banking (product/coverage), capital markets (DCM,DCM), sales/trading etc.

You can't realistically hone your skill set if you have no clue what you are preparing for. And you can't really prepare for everything either since the requirements are different.

A more realistic aim is do get into a good business school and try to jump into front office from there. And I am referring to a proper US/European business school. Not any of the local NUS/SMU/NTU bullsh*t. If you are going to spend all that money and time, may as well make it worth while.