Hey,
Since all your questions are in different formats (Excel/Word/PDF), the first step is to have them all in a uniform format before any worksheet generator could be used on them.
I am assuming you have already typed lot of them in Excel and that you are maintaining a consistent structure in Excel as well.
I can take your excel and based on the structure of it, create a worksheet generator that will be very easy for you to use. Basically, it will allow you to select the questions, group them in sections if required, order them as per requirement and make the worksheet ready to be printed.
You would also be able to add as many questions as you like and modify the existing ones as well.
Does this sound interesting enough to explore more?
Do let me know.
I am a highly rated freelancer here as you would see in my work history here and can assure you that I would be able to create a very intuitive setup for your purpose.
Look forward to working with you and thank you for considering my bid.
Regards,
Rishi