From: Apple iOS 10 Tips
There were ways to print to AirPrint printers and Apps in the App Store, that cost money, that allowed you to print to PDF. Now there is a native solution to print to PDF in iOS 10. An example of how to use this feature is to save the PDF to Google Drive on your device and then print that PDF using Google Cloud Print. See this Google Cloud Print workflow to see how you can print from your iPad or iPhone to the school computers.
You can save almost anything as a PDF. Tap the Action button, then tap Print. Pinch the first page of the preview, then tap the Action button to save or send the document.