There are good investments you can venture into and earn a reasonable amount of returns on your investment in no time. Target the agricultural industry which is fast growing. Buy shares, or invest in them. They return over 100% in 12months depending on the agricultural produce you're investing into.
I think this is a very good advice. If it's possible, I would suggest to not spend all 350 (may an agricultural business, especially animal based, cost only 100 or 150 dollars in your country? Sorry, I don't know the currency value between dollar and yours), but dividing the amount into various options, to have more chances earning interests.
Well if you have that kind of amount, I suggest you invest in a crypto currency but while investing in crypto you must know which would yield enough profit. For me I think bit coin is a good crypto to invest in.
Cryprocurrencies are good to buy when the price is low to sell when the price is high. This is the way some people became millionaire. I only would skip this momento to buy and wait, as cryptocurrencies are too high now, so I think it's not the correct moment to buy, but to earn by play store apps. A day cryptocurrencies price would become low again.
If you study a lot economy and finances, I would invest 50 dollars in stock market, facing high rate dividends (high dividend yeld): but be careful to choose the right company, those that don't have high rate debts, staying away from those on the verge of bankrupticy. This only if compatible with your studies, as stocks are quite demanding in term of time to dedicate.
About betting/gambling I would stay very far away as it could mean poor people gambling all they have
. In my former country people who lost all in gambling committed suicide😭. There are enough profitable business not harmful at all.