Tiger:
Probably this would be my last reply as i dont want to turn PDF into a pre-ISSB training class.
Though verbal grooming doesnt do much of a favour because it cant alter your actual personality, but may it will soothe you.
i'll give you this reply in detail and i hope this will help you.
In ISSB what i personally feel is that you have to 'cash' your positive and guud points and make use of your achievements. Guud personality traits can be being truthful, amicable, regular offerer of Namaz, witty, knowledgeable, guud debater, having a guud hand writing, verbal expression etc etc (this are just example, some were used by me some by my colleagues so it doesnt mean that you only restrict yourself to these and important of all these are just to give you and example, they dont necessarily mean that they have to fit on you, nor it means that your should artificially try to make one fit on your personality)
What i want to say is that you should try to find your positive and powerful points and show those to the ISSB people. Tell them what you can do for the Army and what you are capable of!
But this doesnt mean that you should lie!
For instance, you wrote in ISSB that your are physically fit, but then you are unable to finish the obstacle course or for that matter just completed it for once, you are a gone case then.
Your wrote that you are a punctually offer prayers but the interviewer asks you to narrate Dua Qunoot you give him a blank look.
You say that you are very hard worker and guud at studies but you have scored a 'C' grade in metric, so dude which kind of hard work you have been doing then???
You say that you are amicable, but you happen to put up a fight with a ISSB-mate!
You say that you read a daily as a routine, but he asks you about the editors name you screw up.
So the thing is that you dont have to contradict yourself!
He asks you about your father's pay and your answer is "hmmmm, mmmm, may be like a 50K" WTF, which kind of son dont know about his father's pay, designation and job!!???
He ask your grandfathers name and you say "sorry sir i dont know"
He asks you the spelling of
leftinent and you spell like Lef-ti-Dent, so probably he tell to remove your 'dents' first and then come back again!
Questions can be difficult and question would be easy, but for sure they would be unexpected ones. They will just throw out your personality and your would have nothing to hide
You claim in your papers and bio data in ISSB that you are a 'haji saab' who have never seen a girl in his life but when you write a pictorial story you write the other way round.
He asks you what is the difference between the Zohar Azan and Fajar Azan and you dont know it.
He asks you to narrate the translation of Namaz and your are blank.
He asks you since when are you living in this house of yours and you dont know it.
He asks you how much your house would be costing now a days and you just give him a smile.
The aim of these questions is to check certain things, it may include but is not limited to the following:
Interest level
Keenness
Sharpness
Determination
Lust to gain knowledge
How much you keep your eyes open, etc etc
The thing is that you would not be able to 'make up' the things, yes if you are sharp enough to fool the system, best of luck then.
Three and virtually four different people with different personalities are judging you and the system they employ is a time tested one, so things cant be fooled.
Lastly, work hard on the IQ test, if you are unable to secure above 90% marks in that screening IQ test consider yourself among the failures unless you prove to be a super dude later during the course of the ISSB.
You said that you didnt have a guud educational back ground, that's Ok, i have coursemates who have 'C' grades, but they had a reasons behind why did they screwed up, moreover they had proved that their brain actually works and that grade actually doesnt represent his intellect and it was the background, lack of finances, environments, school, area to which he belonged etc etc that affected his grades, if you can prove that, then your grades would probably dont matter.
Most important every person in ISSB is judged while keeping in view his background and how he has been brought up. For example, if a boy from a village can talk about computers, Internet, Obama, American policies latest trend in book writing and what's new in fashion i think i'll like to have that guy on my team, but an Islamabadian or Karachiiete doesnt know where Black Sea is and he can't name the foreign minister of UK he needs some more time to grow up! Moreover, they would not be expecting a son of a 'motor mechanic' to talk about NASA and life on Mars, and similarly they would be expecting a son of a Brigadier or DIG or a businessman to answer question regarding Harry Porter(when the boy was a kid), youtube, physics, Antarctica, solar system etc etc
So work hard, be clear headed, with a unified aim and then leave rest to Allah, if still you are not recommended, that's not the end of life.
with full preparation and with clear mind. Sir now i will start practice of WAT , story , discussion , sentence completion.
SIR JEE PLZ 
