I teach OCR at A level and like to use AQA and Edexcel exam questions. I convert the exam papers to Word and then I can change AQA’s halogenoalkanes to haloalkanes and Edexcel’s ionization energy to ionisation energy.
1.Open Word in a window and have a list of pdfs in a different window:

2. Select the pdf you want and slide it into the Word window. It will convert to a Word document.
3. The formatting is often a bit of a mess so I usually copy the text and save it as text only in a new document:

4. I then run a macro or two over it to get the formatting correct, as described in my Macros section above.