For enter in the private schools, some private schools take admission test for enter in middle class or upper grades such that for admission in the Independent day schools is required Independent School Entrance Exam and boarding schools is required Secondary School Admissions Test.

Here I am giving you some entrance exam preparation tips As below:-

(a) you should see Review Book so that you can prepare topic such that reading, verbal reasoning, synonymous
(b) You should take care of timing in entrance exam so becoz practice exam in time limit.
(c) You should cover your weak subject.
(d) You can take advice or help of any teacher.