Question

if we( to take )our copy-books with us yesterday , we would have written the test much better

Answer 1

If we had taken our copy books with us yesterday,we would have written the test much better

Answer 2

If we take.
В придаточных предложениях глаголы употребляются в Present Simple.
If she calls me, I will come home.
If we buy a present, he would be happy.
И так далее...