Is physics 12 necessary/advised for top 20 universities?

<p>I’m taking physics 11IB this year (along with bio 12 IB and chem 11 IB), and am getting pretty good marks (96% first term, 98% second, don’t know third yet); however, I don’t really enjoy physics THAT much. If I drop it next year, would that affect my admission chances into the top 20 schools (take your pick for the 20)</p>