How to maximise the use of my savings as a 19yo poly student to increase my wealth steadily for future uses like bto or a car or smth?

You may check out a gold investment app Everest Gold. Their starting capital is only 0.60 USD and charge zero transaction fee.

Very suitable for investment newbies and quite easy to make profits as they just started. Can use my referral code is you interested: WGWLE

they also have signup reward points worth S$40

Im personally using a roboadvior for exposure to US markets as well as POSB invest saver.

Apart from that, im putting my savings into Standard Chartered Jumpstart account which is 1% P.A​​​

It is critical to know the use of these savings and not be allured into going all out into high risk investments. You can decide how you want to segregate the money into the categories as follows:

Emergency funds. A common guide would be about 6 months' worth of expenditure to cover yourself for a short period in the event of an unexpected situation. Since you are still young, you can choose to have lesser emergency funds if you are still fully relient on your parents. To maximise returns without compromising risk, you can go for high yield savings account which are capital guaranteed. This can include Singlife account (non-guaranteed 2.5%), JumpStart (1%) or multiplier accounts if you are able to meet the transaction requirements.

Expenditure/Everyday use. ​​​You can opt for a bank with readily accessible ATMs, PayNow compatible, rebates from spending, etc. Banks like CIMB may not be ideal due to few branches/ATM available and not compatible with PayNow.

Funds that are in excess can be used for investments. I recommend looking at index funds and roboadviors for a start. There's plenty of resouces available on personal finance sites like Seedly and Dollars and Sense to help you understand what are the options available and how they work. Take some time to learn about them before you invest.

If u r thinking of investing, be prepare to lose/ ignore the money. Robo advisory for global exposure. Invest saver for sg exposure

If u r using it anytime, you can consider jump-start saving acc (previously 2%, now 1%) or singlife account (2%+)

The default rule of thumb is higher the reward, the higher the risk.

You can consider p2p lending, debt crowdfunding. Due to covid, now the avg interest rate per annum is about 8-10%.
PM me if u need a guide for it