Admission officials at your potential transfer colleges will pay far more attention to your college grades than to your high school grades, especially those from 9th and 10th grades, so you’re in good shape there.
Although SAT scores don’t play as big a role in transfer admission as they often do in freshman admission, they can count. Is your 1250 SAT score from just the Critical Reading + Math sections of the test or from the Writing section as well? If it’s the former, then there’s probably no need to re-test. But if you got 1250 on all THREE sections of the test combined, it would be wise to try once more … IF you think you can improve (which, most likely, you will since you’re taking challenging English and Math courses now) and IF your transfer college requires SAT scores from its applicants.