 So here's how you approach plugging the hole and making sure that you're keeping that tank as full as possible if you're going to do all the hard work to fill it in the first place. After you go through your questions through your flashcards, your notes, you're reviewing them, you'll start to get an idea of which questions kind of feel uncomfortable. Which questions are giving you trouble? Maybe it was this question that just needed a few repetitions during that evening study session to get down and still you don't feel quite comfortable. For these specific questions, go ahead and put them into a weakness pool using the strategy you're using. So for example, if you're using an outline method in a document, it's very easy to color code things. You can go ahead and just color code the information or the questions that are difficult as like red or orange and things that are relatively easy as green. This gives you a nice visualization of topics that saying, well, next time I come for my second pass, I'm going to start with the reds first because that's the topics that are going to give me the biggest trouble if they show up in the test. If you're using something like flashcards, Quizlet allows you to star flashcards that you really want to come back to. Anki has some great tools such as flagging a card or adding tags to it.