Try solving the past examination question paper. If you have solved last 3 years paper then there is more probability that you can easily pass the exam. Even if don't understand the question paper at first sight as not fully learned that subject.But it will helpful to gain an ability to give weightage to topic based on importance while learning.
But Friend everyone is not lucky to crack the exam by merely studying 2-3 days. So, it's important to study from begining. It will reduce the last hour's pressure while examination.