I have 'twin' boys enrolling into kindergarten. Should I spilt them up into separate classes? What is the correct thing to do?

There is often confusion made between the physical separation of twins and their development of individual identity and independence.

In reality each set of twins have their own unique dynamics and developmental timetables. 

Placement in separate classrooms does not fit the needs of all twins any more than it does placement together. What is true for all twins is that their classroom placement has an important effect on their relationship and their lives. In order for these effects to be positive, their placement needs to be evaluated every year so that it can be adjusted as necessary to meet the changing needs of your children.

Your twins are just starting school they will benefit from the social support they give each other when they are in the same room. They seem to find it easy to engage in different activities when they have the option of being together. When they are forced to separate into different classrooms, they may get the message that there is something wrong about being a twin.  They may suffer emotional stress from worry about their absent co-twin and find it difficult or impossible to do their school work. 

As a schoolteacher, I currently have three sets of identical twins and the final decision about splitting them was left to the parent.  We have one set of twins together and two sets of twins that are split up. In each case the children are fine.  The ones together are never a distraction or too dependent on the other, or feel "overshadowed" by the other's achievements. The ones that are split, it too worked the best because of some of these same issues.

My advice would be to let the children stay together (if they want) for at least kindergarten, then maybe suggest different classes, when they move to 1^st grade.  There are many options that their teachers can exercise when staying together, such as having them work in separate groups or sit at separate tables. Often they just need to be aware of where the other one is. This is more common among identical then fraternal twins, but can be true of twins of any type.

 But the final decision you should know is up to you, (unless there are some real extenuating circumstances).