Guys...
I am really in a mood to BS more..Please excuse me ...
Disclaimer : This analysis is based on my " Personal Opinion" which may or may not match with any PGite ...Doesn't matter anyway

( especially when you have confessed to BS

)..Let's get back to business..
Well, Suppose your Attempt in any MOck ( or for that matter , CAT ) is like this :
VA/RC : 40
QA : 20
DI :25
Now, the basic ingredient for attempting so many question would ofcourse be a pencil...The Analysis which follows will show you what difference your choice of pencil could make...
The OMR sheets has the circle thingies which are around 3 mm in dia..Area = 3.14*9 mm^2 = 28.26 mm^2...For 85 Attempts , this translates to 2402.1 mm^2.
With a 0.5 mm pencil at a speed of 25 mm/s ...you can shade an area 25 mm^2 in one second..So, for shading 2402.1 mm^2 of area, you would need 96 Seconds.
Well, that number is based on a linear analysis. The OMR sheet calls for circular shadings where the speed reduces to half . ( owing to Centrifulgal forces

)...
So, you need 192 Seconds !! i.e. 3 Minutes and 12 Seconds !!
So, play with the lead tip width and get your dream number..If you are able to find a pencil with 1 mm width lead, you can save 1 minutes and 36 seconds ...That would give you chance to do one more "sitter" in QA and raise your percentile by 1 or may be 2 points...
Now, I am feeling sleepy !! Need some tight cozy sleep !! Good night all ! All the best to all for the Pencil Selection...Contact me in case you are struck wih the calculation...
PS : It's not me.....It's my anxiety !! Kindly Adjust !!