hey,
in the SDM test you only have to spot conflicts once. After that it is considered as a mistake and you'll be punished. However, Local conflicts are different from Opposite conflicts, in which case you'd have to spot them both but only once no matter if they climb or descend afterwards. All this will be explained to you before the test, so dont worry.
As to the cubes, you'll have a static net and three possible answers: two static cubes or none of them.
hope it helps*