Scholastic ability test

Today is a scholastic ability test. Every year Korea high school 3rd grade students take this test.

>> Correct

or

>> Every year in Korea, there is Scholastic Ability Test taken by 3rd grade high school students.

Today,I stayed at home. Seoul middle school and high school can\'t go to school on this day.

>> Correct

or

>> Today I stayed at home because Seoul middle school and high school can\'t go to school on this day.

There are a lot of police in this day.

>> There are a lot of police today.

Last year students who take test can\'t bring he or she\'s mask.

>> Last year students who take the test couldn\'t bring their mask.

But this year because of the fine dust they can wear a mask in test class.

>> Correct

Today first class was Korean.And last class will be end at 6.

>> Their first class is Korean and the test will end at 6pm.

Students have to bring their lunch.Because of this day students studied for over ten years.

>> Students have to bring their lunch and today is the day they have been preparing for over ten years.

So, they have to get a good score.

>> Correct

After test they can go anywhere they want. And for 5months they can be free out of studying.

>> After the test they can go anywhere they want. And for 5months they can be free from studying.

I have to take this test after 4years so I will study from now on to get a good grade.

>> Correct