Small scale investment

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I'd like your advise /biz/.
I'll attend university after summer, and I can loan extra cash from the government without interest. There's a maximum of about 1035 euros a month, study takes four years.
In what should I invest the money that I don't use
(most of it probably)?
I've heard people mention storage lockers in the centre of town, to be rented out as garages.
Perhaps some government bonds?
It has to be low risk, interest isn't that important since the student loan doesn't cost me anything.
Thoughts?