Think those exams in high school were tough? Think again. You'd either have to be super smart or study forever just to get pass these super tough exams and interviews:

Rolls-Royce
There are two parts in this interview: The first is the practical, where engineering students will be asked industry-specific questions and must explain how to handle a specific situation in detail.

Those who pass this stage will then have to face the behavioural section of the interview, which tests your ability to deal with suppliers, write contracts, and generally to work effectively with one of the most famous manufacturers in the world.

MENSA
There's a reason why people consider this as a club for the super intelligent. Members must have an IQ of at least 132 on the Stanford-Binet scale.

National Higher Education Entrance Examination (China)
Commonly known as Gaokao (高考), this exam is taken during the final year of high school. Only 60% of students who sit this grueling exam make it on to university, while a mere 0.2% will make it into a top-five school. Even the teachers feel the pressure, with an estimated 10% quitting each year over it.

United States Medical Licensing Examination (USMLE)
This national exam is designed to test a fledgling doctor’s knowledge, concepts, and principles as well as their patient skills. Just like the Rolls-Royce exam, you need to both know your facts but also how to apply it to a real world situation.

FBI
You need to be younger than 37 and older than 23. You’ll need a bachelors degree and a US driver’s license. You’ll also need to be in a good enough physical condition to go through a rigorous training period. Not applicable for those with a felony conviction, a history of drug use, and those who defaulted on student loans.

LSAT
The Law School Admission Test used to be only about a proficiency in reading comprehension, logical, and verbal reasoning along with above-average smarts. These days, applications must also submit a set of their fingerprints to prevent people hiring impostors to take the test.

NASA astronaut candidate program
According to the official homepage, applications are only on an as needed basis which means you'll have to actually wait until NASA decides they need more astronauts. Besides a degree from an accredited university, you'll also need least 3 years of 'related, progressively responsible, professional experience', or a minimum of 1,000 pilot-in-command hours in jet aircraft.

Google
Google's way of hiring people is by focusing on 'emotional intelligence. This means being able to "to process on the fly … to pull together disparate bits of information", and to being able to demonstrate "emergent leadership" which is the ability to stand up and get your voice heard in a productive way. Seems easy enough, until you learn that only 1.5% of Google applicants actually get hired.

All Souls Prize Fellowship Exam
Anyone with a First in their Oxford undergraduate Finals will be invited to sit the All Souls Prize Fellowship Examination, which is held yearly at the end of September. Only a small percentage of the students invited will it actually choose to go through with the exam. Of about 50 candidates who make the grade to sit the exam and decide to take the plunge, only 2 are usually elected. Those who make it through will receive a full-time, salaried Oxford Fellow with a vote, free on-campus accommodation, in-college catering and plenty of other perks for a full seven years.

Indian CA Final Exam
Imagine sitting in a room filled with 100 students while also knowing that only 3 of you are likely to pass the paper sitting in front of you. In 2013, the pass rate dipped to 3.1%. Some students will even attempt to resit for up to five years. But if you do pass, you’ll be rewarded with the tantalizing prize of a career as a chartered accountant.