Thx for the answer.I recommend you to wait, if you get another rejection things would be more harder for you.
GCMS (Global Case Management System) notes will give you the exact reason of your refusal. Order them via thegcmsonline.com or any other similar service you can find by google. You will see in the notes section that officier explaning the ground of your refusal.
You have said before, you are not planning to travel at the beginning of winter semester. Just take your time, order gcms -> revise your sop and add extra evidince to address officiers concerns and then apply again.
Do I need visa to start distance learning then?
As far as I know it doesn't affect the pgwp.
Anyway, I will visit my agent to set a strategy and we will see.