Hi!
Before I started uni I did online surveys and website testing. It doesn't earn you a lot and you may have to wait a while before cashing out, but it definitely tied me over until I could get a proper job.
Some of the best websites that I have used are:
https://www.usertesting.com/For this website you complete a trial run where you review a website, completing tasks and talking about what you like and dislike about the site. If you are accepted, you are then given website tests to do based on which ones you qualify for. You have to speak outline and talk about your thought process when completing the given tasks. It pays $10 per test (usually 10 minutes each).
https://prolific.co/For this website, you have to be fast in participating in studies as they fill up quickly. But if you keep the browser tab open you will be able to get some. They range in price based on how long they take. Essentially, they are research studies and can be about absolutely anything so can sometimes be quite fun to complete.
https://yougov.co.uk/This one is survey-based. You gain points for completing surveys and, once you reach a certain amount, you can cash out. Although it takes a while to build up to the cash-out amount, once you do, you are given £50, so it is worth the wait.
https://www.opinium.com/This website emails you surveys to complete. They are usually 25p, 50p, or 75p each but only take a few minutes to complete. Once you reach £25 you can cash out. These are quite frequent so it doesn't take too long to reach the payment threshold.
Hope this helps!
Michaela - UoP Rep