Improper Integrals: Upper or Lower Bound Is Infinity
Finally, a problem that involves both limits AND integration! Your favorite! I don't like these either, but at least they're easy to spot: they're the ones with infinity in a definite integral. Students tend to make tons of mistakes on these (as do I), but if you practice these on your homework, you too can plug-and-chug through them like a champ.
Improper Integrals with Discontinuities
These ones are hard to spot because they don't have an infinity in them. But then again, limits are really just plugging in anyway, so if you don't notice it's an improper integral, there's still a decent chance you'll get the right answer!
If you do not have an account, you should get one, because it is awesome! You can save a playlist for each test or each chapter, and save your "greatest hits" into a "watch right before the final" list (not that we recommend cramming, but when in Rome...)