...”hi performance“ double box end wrenches. Pretty sure I have 10-12, 12-14 specifically for Asian cars. They can be game changers...
metric thread restorer kit
Especially agree with the above!
I have a set of those double-end flex "Mountain" ratcheting wrenches that gets called into action a lot; look for the set with 8-10, 12-14, and 17-19 wrenches, and put the 13-15 and 16-18 you'll never use somewhere else out of your way. It can be a little subtle, but when buying sets like this some are designed to make life easier for folks working on Asian machinery. And some sets are badly designed in this regard, or skip sizes you'll need.
Since everything I work on is Japanese brand motorcycles and cars, I do the same with my socket and wrench sets. My main drawer contains 8-10-12-14-17-19-21-22-24-27 and all the other sizes are in a secondary location in case a Ford or something weird like that shows up. If I'm working on a Toyota or Subaru or Yamaha, I can pretty much grab the size I need without looking.
As to metric threads, make sure you have the thread file and thread tools needed for JIS threads, which are normally finer pitch than American or Euro brands in larger sizes. M10x1.25, M12x1.25, M14x1.25. (Toyota wheel studs are mostly M12x1.5, Subaru is famed for M12x1.25 studs that strip when overtorqued or banged on with an impact by impatient techs.)
And on a related note, building a small stock of OEM Toyota nuts and bolts will come in handy quite often, especially in M6 and M8. Nothing looks and feels more like glaring hack work than a hardware store M8 bolt with the incorrect 13mm hex head and cheesy looking insta-rust zinc coating.
The advice above to acquire the half-size sockets needed to deal with swollen lug nuts is gold. I'd also add that make sure you have or have access to the tools needed to deal with locking lug nuts. A new tech is probably going to be dealing with a lot of rotations and suchlike.