"I got a few short" is OK. "I was a few short" is better

How about these sentences in the situation, in which they miscaculated, otherwise I should have gotten full points?

A good answer below, but I'd add............... I'd be happy with either of the last two................... ............... "I got shorted a few" sounds as if someone short-changed you, gave you too little change when you bought something................ I got a few short (of the pass mark) ...................... I got a few too few (to pass the test).