I am studying Mechanical Engineering Technology, a major that RIT Dubai does not offer. So for me, matching up classes was a little difficult. However, my roommate ended up easing into her classes quite comfortably. She studies regular Mechanical Engineering. The two most common majors here at RIT Dubai are Mechanical Engineering and Business.
Currently I am taking Statistics 1, General Chemistry for engineers, Engineering Design Tools, and Strength of materials. I recommend around 4 or 5 classes, but don't advise any more than that. This is because you are going to want to enjoy your time here, and not just spend all day, everyday studying. Especially considering that there is a very relaxed tone among the students when it comes to school work. This is very different from RIT in New York. Everyone really likes to hang out and have a good time, so you'll want to make sure that you have time for fun as well.
Classes too are more relaxed in a sense than RIT New York. The work load is fairly similar, yet the demand to get things done quickly is not the teachers' first priority. I will say though, that I could be a bit biased, for when I was at RIT New York we were on a quarter system. This year both RIT Dubai and New York have switched to a semester system which makes for a big difference in that aspect.
As be aware that although RIT Dubai is more equipped than I thought, they do not offer all the same resources as the huge campus in New York. The school is only one building which is composed of 3 floors.
In case you're curious, the mechanical lab has a lathe, mill, CNC machine, tensile testing equipment, compression testing, as well as automatic saws, and power drills. Keep in mind that classes are much smaller so the ratio of machine to student as bad as it sounds.
Being on time should not be an issue, for the walks to class take no longer than a couple of seconds. If you rely on the bus for transportation to and from the dorms than make sure to be prompt. They won't wait for you.