We often immediately lose 50% of what we are studying, so it is very important to concentrate when studying dates. You can begin by simply reminding yourself that you want to and/or need to remember the dates. Concentrating in this way can help you remember 20% to 60% more information. There are various practical ways to concentrate while studying. For instance:  Reduce distractions; try to study in a quiet, stress-free environment. Intentionally focus your eyes on a written date that you are trying to memorize. "Trace" the date with your eyes. When you come across a date you need to learn, take a moment and carefully write it out, thinking “I need to remember this” as you do. Visualize yourself writing the number any time you think of it. For instance, imagine yourself writing the date on a chalkboard in your mind. The more you can repeat information you need to learn, the more likely you are to memorize it. Since we lose the greatest amount of information within 24 hours of learning something, it is important not just to repeat the information immediately, but frequently. If you keep practicing and going over dates every day, you increase your recall and memory; if you keep trying to memorize them for thirty days, you are likely to remember them for years to come. If you need to learn a set of dates for an exam or other purpose, go over them as frequently as you can, spending at least a few minutes each day reviewing the information. Flash cards are a common way to practice memorizing information. If used correctly, they can be a big help.  Using a set of cards (or an electronic flash card program), write each date you need to memorize on one side of a card, and the significance of that date on the other side. Quiz yourself by shuffling the cards, looking at the date on each one, and seeing if you can remember the significance of it. You can also reverse the cards and look at the “significance” side, and see if you can recall the date associated with it. As you go through the cards each session, take out...

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Write a summary of the previous text in Indonesian:
Berkonsentrasilah pada tanggal-tanggal yang perlu diingat atau dipelajari. Bacalah atau latihan ingatan tanggal tersebut berulang-ulang. Gunakan media kartu. Gunakan atau terapkan informasi mengenai tanggal yang Anda ingat.