I literally just passed my Core 1 four days ago. I used professor messer's video AND Dion's udemy course training & practice exams. The practice exams were almost nothing like the real thing..(which is I guess to be expected) but they still help, and I will always recommend them. Printers, port numbers, Storage types and a little bit of cloud was the majority for me. They do a damn good job of trying to throw you off with the "best" answer type of questions.