What's the best way I can grow a spare fund of $10k to offset the $34k of school fees I've to pay at the end of 4 years? ?

You can diversify, put some low risk, med risk and high risk

high risk ones stocks and options will give you the highest and fastest returns

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1) Budgeting

Look at your current expenses and try to cut them as much as possible! This way, you will have more spare cash which will serve as your principle to invest regularly, aside from doing a lump sum investing. The power of compound interest should not be underestimated! Always be investing into your future regularly, you will be grateful to yourself in the future :)

2) Investing

I would recommend putting half the money into money into S&P500 which will guarantee about 10% returns. (around 14k after 4 years) and half into more risky individual stocks. You may consider disruptive tech company stocks, as they have shown exponential growth rates in the last few years.