Just a little background knowledge

Hey , this is my first time ever looking into this type of work and I have no idea what is going on lol . I applied through indeed, got sent a link to “register” made an account and now I have an exam to take before my application goes through ? I dont even understand what the exam is over . My sister works for telus and they had sent her several documents of information to learn before her exam but I didnt receive any. can someone explain what this first exam is and what I need to know?