plan on

[tkulkarn]

is "plan on" correct idiomatically?

I recently took a gmatprep test; in that plan on formed a part of the correct answer choice. In MGMAT CAT, it was explained to be incorrect.

[RonPurewal]

is "plan on" correct idiomatically?

I recently took a gmatprep test; in that plan on formed a part of the correct answer choice. In MGMAT CAT, it was explained to be incorrect.

i think you're talking about this one:
according-to-a-survey-of-graduating-medical-students-conduct-t5501.html

you can decide that one by other factors.

also, they will go out of their way to avoid "X of Y of Z", "X that Y that Z", "X to Y to Z", etc.
we have seen this repeatedly.

in that problem, if you wrote "to plan to practice", you'd create that sort of undesirable repetition. so this makes "to plan on practicing" more acceptable than it otherwise would be.