Wisdom tooth impaction surgery

[abstruse123]

Hi !
I recently visited a dentist when I observed an ulcer at far end of my lower jaw.
Then, I discovered that I got an impacted wisdom tooth in my lower jaw.
My wisdom tooth is horizontal and there is a gap between it and the next molar.
At present, I don't have any pain. Only discomfort.
I was told that the next molar started decaying due to the food trapped b/w the two tooth.
I was then informed that my wisdom tooth is to be removed and also the next molar needs a filling.
My question is how long I can delay the surgery before the next molar needs a root canal treatment?
Can I go for surgery say after 2 months?
I am in a tricky situation as I have an exam coming up within 2 months, exact date of which is not yet known.
My dental x-ray is attached. May the experienced dentists here please advice me.

 

[Zuri Barniv]

It may already need a root canal. I would deal with it as soon as possible and certainly not more than another 2 months.