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<p>Yes, your AP will most likely count at all schools. Now you just need to take Calc III, a course on differential equations (probably linear algebra too), and the first two intro courses on mechanics and electricity and magnetism that engineers/science majors take. You really don’t have that much to makeup. You could even do Calc III and differential equations at the same time since you don’t really need calc III to understand ordinary diff eqs. The only difficulty I can see you having relative to your application is the fact the you have no research experience I am assuming and no publications. This will make it difficult for you to get into a PhD program. I’d suggest getting a master’s degree first.</p>