<p>Yes, you only get 5.3 units, but you can use the AP calculus BC credit with a 5 to fulfill the subject requirement for Math 1A and 1B for the math major and go directly to Math 53 and/or 54 if you want (but see the department’s note about self-studying the introductory differential equations material from 1B if you do skip 1B).</p>
<p>Yes, the stated policy is that they will cancel AP credit if you take the course that covers the same material, so what you expect if you take Math 1B is a reasonable expectation.</p>