A: Firstly attempt those questions you are sure about and then move towards other questions. Go with Exclusion Principle that is if you are able to exclude 2 options out of 4 then go for guesswork and attempt that question. But if you are not sure with your exclusion then donot attempt that question. Because if you cannot make it on positive side at least don't increase your negative score. Carefully read your question, as it always contains some key words which change the whole meaning of the question like not , if and Etc.