Top Law Schools

So from what I understand from reading posts here, someone has to have at least a year of grades to transfer.

If my grades are not on track for the top 15% and I chose to withdraw after one semester, would I be able to retake the LSAT and apply as a new student elsewhere if my score was substantially improved? I go to a tier 2 school, and I understand that you need to transfer to really have a shot at big law from a school such as mine.

If not, if I took a 1-2 year gap to get a masters or for work, would that change the situation?

All of the law school applications I am currently filing out ask applicants if they have ever been in law school before, so outside of formally transferring, I am sure you can drop out, retake the LSAT and reapply elsewhere. I don't think getting a masters is worth the time and cost that it takes to obtain a masters, in terms of an application boost for reapplying to law school. Work experience also looks good, but again I don't think working solely for an application boost is worth the time.