Udemy is a rip-off
I am a long-standing SME and Instructor in IBM MQ.
I wanted to update my certification, and so bought their trial exams as prep.
I didn't even get to the end of the first to know the Udemy author must be a fifth-grader at best.
Many of the questions were garbled, nonsensical, vacuous or repetitive, and answers to the rest plain wrong a high proportion of the time.
A refund was promised, and I claimed it. Nothing happened. Luckily I had not spent a lot of money.
My advice: stear clear of these people. Use a reputable training outfit.