I wasn't a particularly good high-school math student, I usually tested around the top of the school for standardized exams, but never bothered to do the class work for my actual math classes, and was mainly just a jock. I went to the local university to do engineering, and while I got A's in calc I didn't do great overall, i think a 3.3 first semester, 2.9 second semester, and eventually transferred to another school for one semester. The living alone situation didn't work out, and I had pretty horrible grades, three B's and a C in four math courses. I transferred back to my original school, and despite my earlier poor grades decided to do Math, and my grades were really good, none lower than 85%, mainly pure math(GPA was a shade under 4, dragged down by a philosophy course). And my summer session courses seem to be a bit higher, now that I'm taking some applied courses. Having found that I really enjoy math a bit late in university, would my earlier failures at engineering and another school prevent me from getting into a good grad school? (Also the school I go to is a fairly well-looked at primarily undergraduate school).