There are somethings you may have not known about the codility test - they have an FAQ: https://codility.com/candidate-faq/. You can lookup stuff on the web. You can also use an IDE.

For the codility test you need preparation. The problems are not easy and the problem setters underestimate how long it takes to solve a problem. Unless you're regularly participating in coding contests etc, you will not make it. The way we program day to day, and in a timed test env are different. You should not feel bad.