Exam is a set of question or questions for a pool of students to identify easiest set for most efficient student , where most efficient student can achieve close to 100% of marks.
Its changing , Examination is changing and evolving with time. During early 20th century motto or motive of exam was to limit thought of students through marks.
In its widest sense, to examine somebody or something is to look at it very carefully, perhaps to find out why something is not working properly. Someone who is ill may need to go to a doctor to have a medical examination. A machine that is not working properly may need an examination to find out the cause of the problem.
In education an examination is a test to show the knowledge and ability of a student. A student who takes an examination is a candidate. The person who decides how well the student has performed is the examiner. An examination may be a written test, an on-screen test or a practical test. Examples of a practical test may be: driving a car, speaking a language, playing a musical instrument and doing a scientific experiment. An on-screen test is a test which uses the computer.
If the candidate is successful he will have passed the examination. If he is unsuccessful he will have failed. In some cases it is possible for a student who has failed to take the exam again another time.
A student who passes an examination may get a certificate or diploma. Some certificates are professional qualifications, allowing the person to do a particular job, e.g. plumber, teacher, doctor, lawyer.