What's the point, if the NTC has an absolute tolerance of 5% anyway?
A thermistor isn't a precision device. It's a cheap, simple, easy to use device, which gives a reasonable approximation to temperature using simple electronics. Great for controlling a cooling fan or detecting if something has overheated, but no use at all if you need to know absolute temperature with any real degree of accuracy.
You can improve accuracy by calibrating it against a known reference, which may be a workable solution for a one-off, but if this is a production item, you're better off with a platinum resistance device.
Neither will give a response that's linear with temperature, but both have resistance-temperature characteristics that are known, and which your microcontroller can compensate for mathematically. In the case of a PT sensor, that characteristic is actually accurate and well defined, and very consistent between manufacturers. For an NTC thermistor, not so.