Where do Iyengars and Naidus belong in the caste hierarchy?

Iyengar (or Ayyengar) people are a group in the Brahmin caste of Tamil origin. The Brahmin caste is the highest ranking caste in the system, so Iyengar people are very high in this system. The Brahmin cast originated as a sect of society whose primary function was as priests or people who worked in temples

The Naidu group is part of the Kapu caste. Kapu is described as a forward caste, which means that they...

Iyengar (or Ayyengar) people are a group in the Brahmin caste of Tamil origin. The Brahmin caste is the highest ranking caste in the system, so Iyengar people are very high in this system. The Brahmin cast originated as a sect of society whose primary function was as priests or people who worked in temples

The Naidu group is part of the Kapu caste. Kapu is described as a forward caste, which means that they are not discriminated against by the Indian government or excluded from education and work. 

The Kapu caste is part of Shudra, which originated as a caste that serves the other three original caste groups. Shudra is the lowest ranking caste that is not considered "untouchable." The original caste system was divided into four groups and the untouchables, who are outsiders in society. 

Today, the caste system is much more complex, and it is difficult to accurately describe the interactions that determine today's caste status. In general, we can say that Iyengars are from the top of society, and Shudra are from the bottom, but above the lowest, the untouchables.