Srikanth,
There seem to be a few factors that could account for your lower scores. Here is what stands out.
Quant: Questions seeming easy can mean a couple of things. Perhaps, you missed a few questions in a row and now the algorithm is giving you a string of easy questions. Essentially, you are digging yourself out of a hole.
Another take on the easy questions is that some of those questions may have only appeared easy. A question is difficult because most people miss it. Sometimes a question that many miss is one that has a wrong answer that, upon first glance, seems to be the answer. Many students click the wrong answer without really taking the problem apart, thinking
Hey that was easy. They did not, however, see the twist, and had they caught it, they wouldn't have thought the question was easy.
My advice: be careful on a question that seems too easy. Look for those hidden words, such as
not, or integer, or, in the case of Data Sufficiency, make sure not to confuse percent/ratio with actual number.
On the Reading Comprehension side, if your mind is going blank, as you put it, you may be getting anxious. Breathing deeply, so as to control your heart rate, can do wonders. Physiology aside, you may also want to reassess how you are approaching passages. Do you skim too quickly without really taking too much in? This technique, while helpful on easier passages, can really breakdown on the more dense passages. You may find yourself reading and reading the same parts, something that can cause your heart rate to speed up.
A good strategy, if you plan to retake it, is to practice back-to-back RC passages with LSAT tests. These passages tend to be denser, the questions more difficult. Learning how to slow down so you can process the complex information will help you when you face the inevitable difficult RC passage your next time around.
Hope that helps