Hi,
First of all you must have a mindset that you can pass the exam. Please keep in mind that "where there is a will there is a way"
Follow these steps:
1. know the syllabus, then you can understand what to study
2. Know the exam pattern and marking schemes, then you can plan how to study.
3. List out the study material and collect them and prepare systematically.
4. Try to solve the questions within the time then only can speed up your writing speed since speed is the most important factor in such competitive exams.
5. Focus on Reasoning, Quantitative Aptitude, Computer Knowledge, English and General Awareness Sections.
All the best ........