Use a handwriting app. For example, Pen to Print is a quality app that will scan multiple handwritten pages and convert it into text.
If you have converted text in a Pdf,then you can simply upload or drag and drop the Pdf file.
Alternativley save the page as a photo. On iOS, open the photo, press and hold the text, then select and copy it.
You can paste and delete unnecessary characters from diagrams and remove unwanted line breaks.