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Here is the list of 10 toughest exams in the world for students. 

UPSC Civil Services Examination (India)

Gaokao (China)

Mensa Admission Test (Global)

IIT-JEE (India)

SAT (USA)

LNAT (UK)

AIPMT/NEET (India)

California Bar Examination (USA)

Cambridge University Mathematics Tripos (UK)

International Physics Olympiad IPhO (Global)