If you can't get a remap/upgrades/rns-510, then I'd say save the money and put it towards something else.
If I were in your shoes, I'd get a VAGCOM since you don't have Highline computer. Great to know what's causing a fault and allows you to change settings. Dunno what else you have but if you don't have Xenons, go for some better bulbs. Get an arm rest, cruise control and parking sensors if none are fitted. Would also consider a Road angel/pogo if you've had problems with speeding.
If you like music, upgrade the speakers and get an amp and a sub.
Otherwise save the money and go on holiday when you graduate as a reward. Somewhere like the Caribbean., all-inclusive etc.