This is what the book has to say on the spell (since no one linked it yet)
FIX
(PHYSICAL)
Type: P Range: T
Duration: P Drain: F
Most spellcasters have devoted their efforts towards
learning spells rather than mechanics. This can leave
a magician in a bad situation when there is a need for
an emergency repair during a run. Fix allows the spellcaster
to repair damage to non-living materials, including
drones and vehicles. The caster must first touch the
object and then achieve enough hits to beat the item’s
Object Resistance threshold (p. 295, SR5).
Fix can repair any item with a weight equal to the
Force x the spellcaster’s hits in kilograms or less. This
spell can only repair broken items when all the pieces
are present. The weight limit applies to the damaged
part, not necessarily the entire vehicle. For example, if
you have a busted wheel, you would count that weight
not the weight of the entire vehicle. Each hit scored repairs
1 point of Structure rating or 1 box of damage. An
object may only be affected by Fix once and thereafter
may not be repaired again by this spell.
SO, someone shoots out your tire, Fix will repair that with any net hits over the O.R of the tire ( a highly processed item, consisting of Processed rubber from hydrocarbons, Aluminum/copper cabling).
Someone makes off with your alternator Cap, you're screwed.
Your biggest limitations on this spell are the Object resistance of the item in question, and thus the weight of the object (as to gain hits you have to beat the O.R of the item).
So lets look at the Object resistance table (295)
INITIATIVE TYPE dice pool
Natural Objects 3
Trees, soil, unprocessed water, hand-carved wood, metal cold-worked by hand)
Manufactured Low-Tech Objects and Materials 6
Brick, leather, simple plastics
Manufactured High-Tech Objects and Materials 9
Advanced plastics, alloys, electronic equipment, sensors
Highly Processed Objects 15+
Computers, complex toxic wastes, drones, vehicles
So to fix that flat tire, you are up against 9 dice (Manufactured high-tech object and material). Any hits after the resistance test are counted towards the weight of the object... And since a tire can weigh in between 6 and 15 kilos (
https://www.oponeo.co.uk/tyre-article/how-much-does-a-tyre-weigh)... means you need 1 to 3 successes to restore 1 to 3 boxes of damage..... so not really a pristine fix up. (assuming 6 magic, no overcasting, no reagents)
Fixing that drone is even harder.... and probably gets it back to "barely operable" condition... (as 1 hit restores 1 bot of damage.... provided you have the hits to match the weight.)
Would it fix a book when a page has been shredded? if you had the bits and pieces, I would say "yes" and it would be readable. The object you are fixing is a "Book" not a single page of processed pulp product.
Same with an old clay tablet. It's a not a block of mud... its an instruction manual, or textbook, or whatever the intended purpose of the tablet was.
BUT, do keep in mind that Object resistance table and really think about what you are fixing...
A book isn't just a natural product because its made from wood pulp. That wood pulp has been treated by 60 different chemicals, run through 30 different machines, been combined with other materials, and then been mechanically printed on, cut, folded, had more chemicals applied to it, and finally shipped to you... all with minimal human contact... which makes it the very definition of "Highly processed".....
So books very well could be on par with fixing a drone... At that level of effort, you BETTER get the words! (and again, why wouldn't you, you are fixing a BOOK. not a page.)