Making mistakes?

So I am currently a second semester freshmen at college looking to go to law school. Now there are two things a little bit unique about my situation in which I was seeking some guidance.

Firstly, I can and plan to graduate early. I did some research and read a few topics on here and everything seems to point to it being okay. Most of the criticism was fewer grades, etc. A lot of that seemed to prove inconsequential with people still getting into competitive schools as long as they had competitive GPAs. Is this correct? I don’t wanna screw up my chances solely because I want to graduate early. I could pick up a second major very simply but that would be a very costly and time consuming decision and I want to be sure it is necessary if I do such.

Secondly, I want to do my final year (Junior year) abroad. My school offers a really cool full year program at the London School of Economics. Being an Economics major this seemed really interesting to me and all around seemed like a good experience and good resume builder. Despite this, their the classes are year long. So I would in fact be taking 4 classes over 2 semesters at 16 credits a semester (32 total). Would this impact my admissions process in any way? I am not sure exactly as to how the grading system works, but I would assume I would still receive a letter grade at the end of each semester despite continuing the class.

Be sure that you’d get As at the London School of Economics. Some foreign institutions don’t have the grade inflation that US schools have; for example, when I studied abroad in French-speaking countries, a 17 out of 20 was very good, but that is about an 85, or a C. I assume that you’d take at least a year off between college and law school (which is the way to go these days), and consider if recommendations might be kind of stale in professors’ memories with that gap in time.