To crack the exam in first attempt is not tough, Only you should be focused & motivated to your goal & do hard work with your study, Here are some important tips you can follow for the exam preparation:

Make a time table - It will help you to be more systematic for the Examination. The timetable should be prepared to divided equally distributed for each subject. It will also help you to cover all the syllabus and this will boost up the preparation process as well.

Read Newspapers Magzines - Read News Paper & MAgzines regularly and stay updated with the current affairs. Make sure that you give a maximum priority to the difficult topics or subjects.
Practice with previous year papers- Practise with the previous year paper This will help you in having an idea of what will be asked in the actual exam and also the level of the questions. Do practise as much you can.
Join Mock Test- Join Mock Tests, It will help you to analyze your performance, as many as test you will give, It will boost your confidence.

Good Luck!