IMO if you are rejected from VA Tech I would not assume that you can easily transfer in after a year. You should check VA Tech’s policies but many/most colleges take into account a student’s HS record and standardized test scores for transfer admission into the sophomore class.
The idea of applying to one college as an engineering major where your math SAT is below the schools 25th percentile AND standardized tests are considered “very important” (per the common data set) is an absolutely horrible idea. You have a very limited amount of time to put in applications to a couple of match/safety schools. It is unreasonable to think that there is only one college where you can have a great 4 year expereince and get a fine education.
I think everyone here hopes you eventually get into VA Tech but you should be prepared with a strong Plan B.