Preposition

Personally, I use on, and I prefer it, but I've also heard people say in. Either is possible.

CJ

I always use "in". This may be a BrE/AmE thing. If you place any faith at all in Google search stats:

69 from *.co.uk for +"do well in the exam".

1 from *.co.uk for +"do well on the exam"

Thanks Mr. Wordy, but I would like to which one is British and which is American? I would like to use the British form.

Thanks,
Prasanna

Mr. Wordy gave you BrE statistics. Use "in."

And, is "on" used with bus,train etc. like on the bus, on the train etc. in British English as well?

Or, do they use in sometimes with trains, buses etc.

Ex: I am on the bus
2) Is there anyone in/on the train that has a camera?

Sentences like the above, and in general also.. Do they use in or on?

Thanks,
Prasanna

In BrE we normally say:

"on the bus"

"on the train"

"on the plane"

"on the ferry"

"on the coach"

"in the car"