I was wondering, Does anyone have a list of thac0 for all the classes. Like wwho has the highest thac0, lowest thac0, medium thac0,
thanks in advance.

As for a table that gives the progression of the base THACO according to race, class, and level I don't recall ever having see one anywhere. Of course items will affect THACO as well.

Kind of generic, but fighters have the best THAC0, followed by clerics, then thieves, and finally mages with the worst. A fighters gets better with every level up (to a certain point), while clerics, thieves, and mages have to wait more than one level for theirs to improve.

Fighters, Paladins and Rangers have the best starting THAC0. Then come clerics and druids. After that you get thieves and bards, and mages have the highest THAC0. Nobody could print a table of this though, as items affect THAC0, as do weapon proficiencies and your strength ability score.

All classes start with a THAC0 of 20. In order of best to worst:

Warriors lose 1 THAC0 point per level, and gain a weapon point on levels that are multiples of 3.
Priests lose 2 THAC0 points every 3 levels, and gain a weapon point on levels that are multiples of 4.
Rogues lose 1 THAC0 point every other level, and gain a weapon point on levels that are multiples of 4.
Wizards lose 1 THAC0 point every 3 levels, and gain a weapon point on levels that are multiples of 6.

Priests and Rogues have essentially the same THAC0 breakdown. Also remember that a Rogue will level up faster than a Priest, so they're actually better fighters, except for the armor issue.