data use for track1 and track 2

Hi!

I wanna know that can we use data from track2 to train track1 model? Alse use data from track1 to train track2 model? Or we are exactly supposed to use both data from track1 and track2 to train one model, and submit for 2 tasks?

Yes, you can use data from Task 2 to train the Task 1 model, and vice versa.