I just bought the 10.5 iPad pro for school and I am junior level Mechanical Engineering major that deals with a lot of free body diagrams. I need help selecting a notetaking app where I could copy images from PDF's and drag them onto the notetaking page which I can use to answer my homeworks on. The app must also be able to create a printable PDF of said homeworks (or other acceptable format) that I could print out at school so I can submit them to my professors. I believe that the app Goodnotes would be the best match for what I am looking for but I would like some other opinions as many of the notetaking apps I have looked at all have to be paid for. Thanks for the help.