I need to categorize theorems like School Book Theorem, Important Theorem, Interesting Theorem etc with different numbering. The same at the exercises.

How can I do it?

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    Welcome to TeX.SX! It would be great if you could show us what you have tried. Posting a minimal working example that indicates what you are trying to do makes it easier for people to understand what you want. It also makes it easier for people to help you, since they have some code to start from, and hence much more likely that some one will try to help you. – Andrew Nov 28 '18 at 8:41
  • You are right. I fixed it! – Kώστας Κούδας Nov 28 '18 at 8:58
  • @ΚώσταςΚούδας please click on the link above and see what a Minimal Working Example is. – koleygr Nov 28 '18 at 9:43
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    Try searching TeX.SX for \newtheorem.... For example, tex.stackexchange.com/questions/144535/… – Andrew Nov 28 '18 at 9:58
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    I'm voting to close this question as off-topic because solved in comment (the user found the solution by himself after knowing which macro to use) – CarLaTeX Dec 1 '18 at 12:58