Hi, I'm 19. I graduated when I was 17, I worked as an apprentice for 18 months, before getting pulled into my companies estimating division, where I have been for the last three months. Anyways, I am bored as hell, and was thinking about going back to school for engineering, but I have some fears I wont be able to handle that kind of job. I did well in school, I finished with like a 3.8 if I remember correctly, but am unsure if that means anything, as I went to a poor school and never took anything past Algebra 2. I went and purchased a common freshmen physics book "Principles of Physics: A calculus based text" by Raymond A. Serway. Over the past three months I have been going over it maybe 5 hours a week or so, and have just finished chapter 21's end of questions. I mainly have focused only on the Challenging rated problems, and so far have been able to complete around 65% of them, I am hoping to raise that percentage once I get a real Calculus book (Dumbass me started with the calculus based physics book), as all I know of calculus is based on short 15 minute tutorials I looked up on the web. Is it a good sign so far? Or are those levels of problems suppose to be obvious to a freshmen? Cause I have spent over half an hour on alot of them. Another thing that concerns me, is I am not gifted with an agile mind, even if I know something, it doesn't come to me right away, and usually takes a few minutes. Would this be a huge problem for an engineer, are they expected to just be able to rattle off on stuff off of the top of their head? Well, thats it for now, thanks for any advice.