Oil burning is going to be due to rings, valve seals, or both.
Valve seals (no test for that) is a doable repair. Piston rings (compression or leakdown test may help verify this) means an engine overhaul.
The mileage on the vehicle is low and in theory should not be going through oil that fast.
My feeling is that there’s a history of overheating, lack of regular oil changes, or both; with the former being most likely. Overheating will kill piston rings and valve seals both.
If the engine oil level was at the FULL mark when you bought the car you now know the seller was likely aware of this problem and decided to dump the car on an unsuspecting person.