Explanation regarding mock test questions.

Sir, I have am going to give the examination of RBI Assistant, 2015. So that I gives daily mock test on this website. After giving test result is displayed, some questions I didn't understand or some questions gets wrong in the test. So I wants explanations regarding these questions whether it is of English, Reasoning, Maths, GK or Computer.So Sir, how can I get these questions with how to solve explanations.
Kindly inform me as soon as possible.

Thanking You.