Previous year papers - Take one or two unsolved CDS previous year papers, each of English, General Awareness, and Elementary Mathematics, and solve them within the stipulated time limit.
Solving an entire paper may sound a bit ambitious but correctly solving the entire paper is not the objective of this activity. This activity will help you to identify your strong and weak areas.
You will have an idea of which sections you are comfortable in and which sections need effort to improve further. Besides, this will also help you get acquainted with the CDS exam pattern.
Brush up on your weak areas - After identifying your weak areas, follow any good study material (from books for the CDS exam or online material) to brush up on these topics.
Solve the question papers of at least the last 8-10 years, of all three sections extensively while keeping keynotes on questions/topics of importance.
CDS mock tests - Follow online sources for CDS mock tests and current affairs capsules. They help you to skip extensive study for the General Awareness part
Time Management - Time Management is of extreme importance. You will have to solve 100-120 questions in 120 minutes.
In the first go, read and comprehend the type of problem (i.s. easy, medium, or hard) and solve the problem if you find it to be easy. After the thorough first attempt, go for the questions you found moderate or tough in the first go.