Learn by heart - when they have to memorize something so well that they can say it without having to read it.​, Put thinking cap on - If someone uses this idiom about learning, they think hard about something. It’s often used when someone tries to solve a problem.​, Tell tales out of school - you are simply gossiping or sharing secrets that will probably cause problems for someone else.​, Draw a blank - ​You can use this idiom when you can’t remember or find something. It’s often used when someone asks you a question, and you can’t think of an answer, Rack someone's brain - it means they are struggling to remember or think of something.​, Copycat - This short idiom refers to someone who mimics or copies the actions of another person, and it usually has a negative connotation.​, Crack a book - it means you should open up your book and start studying. However, this idiom is more commonly used with a negative.​, Teach an old dog new tricks - ​people use it when they want to point out that someone has their own way of doing something for a long time and that nothing will change no matter what.​, Pass with flying colours - This idiom is used when you want to say that someone has done something extremely well, such as passing an exam. Although it’s considered a school idiom, you can hear it everywhere.,

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