Learn World Toughest Exam Ranking and How They Compare

Editor: Hetal Bansal on Aug 14,2025

 

Most individuals believe that exams are a normal part of school or college life, but in the world, certain tests are particularly challenging, even for the brightest and most diligent students. These can be called the most difficult tests in the world as they take years in their preparation, profound knowledge, mental strength, and even physical strength. Certain ones are academic degrees, others are government employment, and still others are professional licenses. Let us look at the most difficult exams in the world.

UPSC Civil Services Exam in India

The UPSC Civil Services Examination is popularly regarded as one of the most difficult tests in the world. It is the key to high-profile Indian government employments such as IAS (Indian Administrative Service), IPS (Indian Police Service), and IFS (Indian Foreign Service).

Structure of the exam

The examination will be made in three phases: our Preliminary exam, Main exam, and Personal Interview. All stages assess various skills that include the reasoning capacity, the writing skill, and the leadership characteristics.

Why is it so hard

The syllabus is huge, including one in areas such as history, geography, economics, ethics, and current affairs. A lot of candidates take years and years to prepare, and yet only a negligible percentage pass it. It is a tough competition since millions of people apply annually, but a small number-hundreds, make it.

Gaokao Exam in China

The Gaokao is China’s national college entrance exam and is considered the toughest exam in the world for high school students.

Structure of the exam

It is a two or three-day marathon exam with subjects like Chinese, Mathematics, and a foreign language (often English), along with optional subjects depending on the student’s focus.

Why is it so hard

It is a high-stress system since scores obtained in Gaokao determine the universities that students can access. The importance of the exam in China is such an exam that, when passed, a graduate of an excellent university can receive a huge contribution to their future life. It is one of the most difficult exams in the whole world since it takes numerous hours of preparation each day.

CFA Exam for Finance Professionals

The Chartered Financial Analyst (CFA) exam is globally respected and known as one of the toughest exams in the world for finance and investment professionals.

Structure of the exam

There are three levels, and each level has a pass rate of less than 50%. The tests cover ethics, investment tools, asset valuation, and portfolio management.

Why is it so hard

Both the comprehension of high technical knowledge and robust analytical skills are required in the CFA. Maintaining a work and family life, and studying more than 300 hours per level are common among the candidates. All three levels can require many years.

All Souls Prize Fellowship Exam at Oxford University

The Souls Prize exam is often called the toughest exam in the world for academic thinking and reasoning.

Structure of the exam

The test has essay-based questions, including one famously vague question where candidates are asked to write an essay on a single word like “Water” or “Innocence.”

Why is it so hard

Fewer students are asked to sit to take this exam, and even fewer are chosen for the fellowship. It is a trial of imagination, scholarly thought, and the power to think outside the books.

USMLE for Medical Professionals in the USA

United States Medical Licensing Examination (USMLE) must be considered by everyone who desires to become a physician in the USA.

Structure of the exam

It is a three-step process that gauges everything, including medical science basics and skills in patient care.

Why is it so hard

Medical students have to absorb huge masses of knowledge, and secondly, they are required to utilize it clinically. The process of preparation is also tedious, and some take years before getting ready. This has made it one of the hardest examinations to be taken as a healthcare professional around the world.

GATE Exam in India

The Graduate Aptitude Test in Engineering, or GATE as it is called, is attempted by engineering students to gain entry into the best postgraduate courses or even in some good-paying employment in public sector companies in India.

Structure of the exam

It has one sheet that tests engineering, mathematics, and analytical abilities.

Why is it so hard

Both complex technical and fast problem-solving skills are also prerequisites for the questions. This is being of the most challenging exams for engineers in the world.

most toughest exam in world

California Bar Exam in the USA

For aspiring lawyers in California, passing the California Bar Exam is a major milestone and a huge challenge.

Structure of the exam

It includes multiple-choice questions, essays, and a performance test that simulates real legal work.

Why is it so hard

The pass rate is lower compared to many other US states. Candidates must demonstrate strong legal knowledge, logical reasoning, and the ability to write well under pressure and manage their time effectively.

IIT JEE Advanced in India

The Joint Entrance Examination (JEE) Advanced is the entrance test for the Indian Institutes of Technology (IITs), which are among the best engineering colleges in the world.

Structure of the exam

It has two papers, each testing physics, chemistry, and mathematics at a very advanced level.

Why is it so hard

The competition is fierce, with only the high scorers from the JEE Main eligible to sit for JEE Advanced. The questions are tricky and require deep problem-solving skills, making it one of the toughest exams in the world.

Mensa IQ Test

While not a traditional academic exam, the Mensa IQ Test is known for its difficulty because it measures pure intelligence rather than learned knowledge. It challenges problem-solving skills under strict time limits.

Structure of the exam

The test has puzzles, logic problems, and pattern recognition challenges.

Why is it so hard

Only those scoring in the top 2% of the population qualify for Mensa membership. This makes it one of the toughest exams in the world in terms of cognitive ability.

KSAT in South Korea

The Korean College Scholastic Ability Test (CSAT or Suneung) is South Korea’s version of a high-stakes college entrance exam. It plays a crucial role in determining a student’s future opportunities.

Structure of the exam

It includes Korean language, mathematics, English, social studies, and science.

Why is it so hard

The entire country seems to pause on exam day—flights are delayed, and offices open late so students can focus. The level of competition and pressure is among the highest in the world, making it one of the world's toughest exams for high schoolers.

Conclusion

When we go to exams, we tend to think of going home after a couple of weeks of preparation and taking a couple of hours sitting in a classroom. However, the hardest tests you can find in the world require years of training, amazing concentration, and mental strength. In China (GaOkao), the USA (USMLE), and many more, these exams are not merely tests, however, but life-altering tests where careers and destinies are made and broken. Academic, professional, or specialized, the most difficult examination in the world is not only related to learning, but it also includes endurance and determination.


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