Install Safe Exam Browser
For writing exams on Windows and Mac OS you need to have Safe Exam Browser installed.
If you need to install Safe Exam Browser you can download it here: https://safeexambrowser.org/download_en.html
Once Safe Exam Browser has been installed you can sign in with your school account at https://student.chromex.io
After you've signed in you should see a list of active exams. If the exam is to be written using Safe Exam Browser you will get a button that you can click that will open the exam directly in Safe Exam Browser.
Your browser will ask you if you want to allow ChromEx to open the link with another application.
If you do not get the question to allow ChromEx to open the link then try another browser and make sure you have installed Safe Exam Browser.