Almost every degree does not have a practical element to it (apart from A&F, pure finance), especially economics which is a complete waste of time if you want to get into investment banking. Its laughable when people who do Economics have the sentiment that their econometrics ability will be praised upon in the bank. But what they do not realise is that being able to quickly utilise MS Excel is much more preffered than being able to regurgitate the black-scholes model. A business management grad from a target, with an understanding of excel >>>> semi-target economics,mathematics.
Do a relatively easy degree from a taget, and use the spare time you have to learn something that can actually be utilised in what you're going to do in the next 3-4 years.