ANSWER:

You can study this only to pass the exam while hating it in your heart. 

It’s best if you write at the end that this goes against Islamic beliefs. 

I read in school. In our Bengali book there are stories and poems which contain shirk beliefs. We have to read and study them to get marks in the exam. Will I become a polytheist (Mushrik) if I read and write them in exam if I don’t believe in those this things?

Halal/Haram Matters, Shirk and its different forms | August 21, 2020 1:39 am
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My grandma used to do this. Take onion peels, chilli , hair of a broomstick etc and wrap them in paper and take it in front of me and wave it and then burn the paper and the stuff inside it. This was done to remove evil eye and was checked by what the smell of the object burned indicated. Is this sihr which is apostasy? Do other ppl who believed this also fall into apostasy?
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At what age does it becomes obligatory for men to start growing beard?