I am still studying in university right now, i won 4D of 50k SGD. How should i manage the money? its not too much but its a considerable sum too. I do have a portfolio of ~15k SGD right now.is reit g?

First of all, congratulations. $50,000 is indeed a good sum to start sorting out your finances.

Before you start, have a good emergency fund buffer in case of any rainy days. Meanwhile, I hope you at least have a shield plan to prevent any unforeseen huge medical bills. Then, you can proceed with investment. Just to take note, money invested should always match your intended time horizon and appetite. Short term foresight makes investment fluctuation tricky.

Whether is REIT good, depends on whether you understand how to invest in REIT cause there are certain analysis to be done. If you are going for dividend investing, this is definitely one of the alternative. However, there are also different asset class of ETF and unit trust to help you construct your portfolio and align with your investment objectives. To fully understand, you may want to consult an advisor to go through every bits with you to shorten your learning curve.

If not, you can even drip the $50,000 resources to pay off your university loans should if it's required for you.