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Donno about others..

But Sri Chaitanya Jr Kalasala... d ICON programme is good enough....

Re:discussion for aieee paper

no shortcuts.....
I believe they are not good for exams like JEE.... you better take a minute instead of going for a shortcut and ending up in a negative score.......better look for speed by practising many problems...

I expect something between 330 and 345....

There is no reason why the two small capacitors must be at the same potential difference.......
while solving such problems, we assume a thin metal plate between the dielectrics and take them as combinations of capacitors..........
a metal plate implies same potential at the interface which in turn means the potential difference across the two capacitors is the same.....
but there is no plate, so no question of taking equal potentials or potential differences......
as the solution goes, divide the larger capacitor into two halves... each of capacitance 6 C.......
then 2,6 in series give 2*6/2+6=12/8 and 4,6 give 4*6/4+6=24/10
these in parallel...
so, they add up to give 39/10or 3.9 C