Mock test is an examination where the marks may or may not be counted, which serves chiefly as practice for future exams or so that the teachers are able to set a grade before the end of term.
Mock tests are similar to final exams where the paper pattern is similar and so is the marking scheme used to gauge actual potential and iron out your weaknesses.
Mocks are very helpful in knowing where you should improvise and where your strengths lie, they help in performing better and give you results on time consumption per question.
Giving mock test for any exam is one of the greatest tips to crack that exam. One should appear for mock tests when he thinks that he is now ready to the main exam. He may not have much doubts in that subject. Well, mock test will help you to clear the concepts, will help to be ready for the main exam.