I will graduate with a BS in math in fall 2021 after 2.5 years, so I wish to enter a top math graduate program the next semester. However, after some Googling, it appears that there's no info about whether the top graduate math programs even have spring admissions. The closest I saw was a similar question about biology, but assuming that the info given there also applies word for word to math would be foolish.
Also, I heard that even if a university doesn't have formal spring admissions, you may be able to pull some strings. His reasoning, loosely paraphrased, is "if I was in charge of admissions, why would I wait before admitting a good student and admit everyone in one month?" If this is true, how should I pull the strings?