Hey please don't give up just because it seems difficult. There might have been a reason why you wanted to do it. Explore it and you may find some strength from it (just like Jeff says about writing down 3 reasons why you want to become a CPA).
If you don't mind I have a few suggestions. If you are in this line, start with your strengths or what seems easy to you. If you thing REG is your strength, then go with it. But it is also the toughest exam. So after you pass it, this is the first exam that is close to the expiration (if it takes time to complete within the 18 month timeline). .
Study questions are meant to help us learn the material. I don't think we have to get them right first time. I do them like this. I look at the question and try to guess the answer. If I don't know or am not sure, I look back at the material to relearn the material. The subject matter is vast and it takes time to grasp it.
You may also try coaching classes. Another option is taking courses at the local community college.
I think anyone can learn it if you really want to get the qualification. The trick is to find out smart ways that works for one.
Hope this helps. If not anything, your post has made me more motivated about my desire to work at it, no matter what. So thanks for that.