How do you score more marks in pqt subject in engineering fourth semester exam?

I am a Engineering Student who passed off in 2005, I have written PQT 5 times and the highest i have got was 12, but the last time i wrote I got 78 for 100... Which is really amazing... Coz PQT is not an easy subject, it needs understand, logic and most of all concentration, unless u have all 3 in hand, its better you don't even think about it. Please make sure you get through the models well, work them out at-least 5 times in repetition and make sure you remember each and every formulae in them. When you goto the exam hall, don't talk to any of your friends, just keep your mind calm and your brain relaxed, go in and do well all that you know. Most Important : Anna Univ people love the clarity of the paper, so do your exam without any scratches or errors, and most of all draw a box around your final answers, because that will save them the time to go throughout the entire paper and its from my personal experience so please box it up when your done. Good luck all.... A PQT Warrior !!!