Venation is the arrangement of?

Pinnately Net-Veined, and Palmately Net-Veined

I think Chikoo leaf has a parallel venation because if seen in a microscope its veins are not scattered they are parallel to each other.

The only difference is that the Parallel venation has veins parallel to each otherand in the Reticulated venation the veins come out from different parts of the main vein.

arrangement (an organized structure for arranging or classifying)

Net venation in leaves is when vascular tissue (the veins, or vascular bundles) branch out and rebranch throughout the leaf. It is normally seen in dicots.