Teacher would really need someway to grade students answers after they take quiz. So teacher should see answers and have possibility to give points or turn wrong answers to right answers, because student might have wrote the answer so that Ari Quiz couldn't check it correctly.

In written text answers this ability would come in help too. Teachers could give out points and let Ari quiz know that answer is correct, so it would dd points to students results.

We should remember that in schools, teacher have the final say of points in students answers.

Yes, i agree - we also need this functionality badly