Working as a Function Bartender works wonders on the savings account! Since you work on functions, you have irregular hours, your days off will most likely be on a weekday, and you'll some times be asked to work in another department when yours is quiet. The bad side however, is that you get fatigued a fair amount, and you lose a large chunk of your social life... but your savings account will get bloated!
Another way is to save cash, not much, just the minimum for a "time savings account" or whatever your current bank calls it. Basically, you'll be "locking up" your cash for a certain amount of time. Within this period, the bank can use your money for other things (like loans), but once the time is up, you gain a certain amount of interest (depending on your initial deposit for the timed account).
Make sure to budget! Buggeting your salary/ allowance can help you a lot when you want to save up cash. Budgeting also helps you lose weight!
Thinking of making money? One of the safest ways to earn money now is to play the "currency game". The idea is that you buy a large amount of a certain currency (something stable!!!) and you wait for it to appreciate. Once the price appreciates, you can then choose to keep it or sell it... Much like stocks, but with a smaller risk. MAKE SURE TO SELL! If you and your advisor/mentor (can be anyone you trust with monetary issues) think that the money you've invested on has matured a fair amount, sell. Theres no use in just hoarding and not selling...
With all that said, you can actually do all of them at once! Work hard to earn money, while budgeting for cost-effectivity. Then getting a timed savings account to accumulated interest. And once you've got enough cash, you can buy a nice, stable, and expensive currency to invest on (ideally you'd want to buy a large amount to get the full effect). Lastly, when everytings ripe for the picking, sell! It's all repetition from here on.