An entrance exam is usually a requirement for a person to get into an institution. For example, you can say "I was required to write an entrance exam to be accepted into university."
"entrance exam"（[入学](https://eikaiwa.dmm.com/uknow/questions/55892/)試験）は通常ある教育機関に入学するために必須です。例えば、次のように言うことができます：
"I was required to write an entrance exam to be accepted into university."（大学へ[合格する](https://eikaiwa.dmm.com/uknow/questions/59619/)ために入学試験を受ける必要がありました。）
The most common of these expressions in "Entrance Exam." "I am studying for my entrance exam into medical school."
Entrance Examination is the formal way of saying Entrance Exam. "We will grade the entrance Examinations tomorrow morning."
Entrance Test is very rare to hear but it gives the same idea as Entrance Exam, just meaning a test you take to be accepted into a school.
一般的な言い方は "Entrance Exam."です。
"I am studying for my entrance exam into medical school."
医療の学校の[入試](https://eikaiwa.dmm.com/uknow/questions/55892/)のために[勉強](https://eikaiwa.dmm.com/uknow/questions/51432/)しています。
Entrance Examinationは Entrance Examのかしこまった言い方です。
"We will grade the entrance Examinations tomorrow morning."
明日の朝、入試の採点をします。
Entrance Testは、あまり聞きませんが、 Entrance Examと同じような意味です。
入学試験は 英語では Entrance exam です。
例えば : My high school entrance exam is next week.
(わたしの高校の入学試験は来週です。)
I need to pass the entrance exam!
(入学試験を合格しないと！) と言いたときに使えます。
When speaking in terms of schools or colleges or universities, the name of the specific exam taken which leads to either acceptance or rejection is usually known as an 'entry' or 'entrance' exam. It may also be known as a 'selection exam' - especially if there are various rounds of the selection process such as interviews. doctors examinations, family or passport checks etc
The best way to say you are taking an exam to get into a school/college would be 'an entrance exam'
An examination is the formal word used for exam - exam is the shortened word
An exam can also be called a test so when talking to your friend you might say 'Entrance test'
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