<p>Some colleges will rescind admission offers if the senior year grades are significantly lower than previous grades. These are usually detail in the conditions attached to admission offers. Some are known to have specific thresholds of GPA or grades, but others vaguely say something like your senior year performance has to be consistent with your past performance.</p>
<p>If in doubt, check the college-specific forums to ask if anyone knows what the college’s typical conditions are. Also, check each college’s AP credit chart to see what AP tests are actually worth studying for (although if an AP course is worth anything, the student should be ready for the test just from doing well in the course). In any case, doing well in senior year courses will help in preparation for any college courses which assume the high school senior courses as prerequisite knowledge.</p>