California Bar Exam in the United States is considered the world's tenth toughest exam.
The United States Medical Licensing Examination (USMLE) is a three-step exam for medical licensure in the US. It is said to be the world's ninth toughest exam.
India's Graduate Aptitude Test in Engineering (GATE) is an entrance exam that tests the comprehensive understanding of undergraduate subjects in engineering and sciences for admission into technical postgraduate programs. It is reportedly the eighth toughest exam in the world.
The Cisco Certified Internetwork Expert (CCIE) certification exam is considered the seventh toughest exam in the world. It is a series of technical certifications for senior networking professionals who design, maintain and troubleshoot complex enterprise networking infrastructures.
The Chartered Financial Analyst (CFA) exam in the US and Canada is reportedly the world's sixth toughest examination. Candidates are required to pass three levels of the exam covering areas, such as accounting, economics, ethics, money management, and security analysis.
The Graduate Record Examination (GRE) in the United States is said to be the world's fifth toughest exam. It is used by thousands of graduate and business schools to make admission and fellowship decisions.
The Mensa exam in England is the fourth toughest examination in the world. This test gives an indication of general cognitive abilities, represented by an IQ score of between 85 and 145.
India's UPSC Civil Services Examination is said to be the third toughest exam in the world. Over five lakh candidates appear for the examination annualy.
India's IIT-JEE is an entrance examination for Architecture and Engineering courses. It is the world's second toughest exam.
China's Gaokao Exam is considered the toughest exam in the world. About 1.2 crore candidates take up the exam every year, which reportedly takes around 12 years of preparation.