Am i crazy or does MIT Aero/Astro cover the essentials in 2 years?

<p>Hey, im a freshman now, and I got some questions on how grades work (for when im on grades next semester)? Do you have to be a standard dev above on every test to get an A? Is the bare minimum B the average? Do devs tend to level out (for example, say the dev is 20 on one test, and 10 on the other, would the dev for the average combined score be less than 15?)</p>