What is a high IQ for a 13 year old?

When considering the IQ test, normal intelligence or an average level of intelligence is said to lie between 90-100 points. Between 100 and 110 indicates higher intelligence, from 110-120 is extremely high intelligence (about 2 percent of the population), and above 130 implies that the tested individual is of a superb intelligence (about 8 percent of the population). Genius levels are past 140 according to Mensa International.

Your IQ score is independent of your age, so if tested properly, your IQ should remain the same throughout your life.

Anything above about 120 would be exceedingly good for anyone, to directly answer the question.