i actually got hardcopy from GO , but now its not available . If not you can take from this site https://printster.in/ their costs are reasonable .
Yes, All the previous years in the sense
In the new book which should come by April end, 2018 questions will also be included. Not a guarantee but if possible some standard book questions might also be included.
But if you can't solve numericals in GATE, 90% of time it is due to lack of proper theory….