Whether applying for a job through Tamil Nadu PSC or admission to higher studies like Secondary / Higher Secondary / Graduation or PG etc., some seats are reserved for selection relaxation. Following list showing Scheduled Castes (SC) and Scheduled Tribes (ST) in Tamil Nadu must be referred to fill-up the category of the candidate for eligibility.
List of Tamil Nadu Scheduled Castes
- Adi Andhra
- Adi Dravida
- Adi Karnataka
- Ajila
- Arunthathiyar
- Ayyanavar (in Kanyakumari district and Shenkottah taluk of Tirunelveli district)
- Baira
- Bakuda
- Sandi
- Bellara
- Bharatar (in Kanyakumari district and Shenkottah taluk of Tirunelveli district)
- Chakkiliyan
- Chalavadi
- Chamar, Muchi
- Chandala
- Cheruman
- Devendrakulathan
- Dom, Dombara, Paidi, Pano
- Domban
- Godagali
- Godda
- Gosangi
- Holeya
- Jaggali
- Jambuvulu
- Kadaiyan
- Kakkalan (in Kanyakumari district and Shenkottah taluk of Tirunelveli district)
- Kalladi
- Kanakkan, Padanna (in the Nilgiris district)
- Karimpalan
- Kavara (in Kanyakumari district and Shenkottah taluk of Tirunelveli district)
- Koliyan
- Koosa
- Kootan, Koodan (in Kanyakumari district and Shenkottah taluk of Tirunelveli district)
- Kudumban
- Kuravan, Sidhanar
- Madari
- Madiga
- Maila
- Mala
- Mannan (in Kanyakumari district and Shenkottah taluk of Tirunelveli district)
- Mavilan
- Moger
- Mundala
- Nalakeyava
- Nayadi
- Padannan (in Kanyakumari district Shenkottah taluk of Tirunelveli district)
- Pagadai
- Pallan
- Palluvan
- Pambada
- Panan (in Kanyakumari district and Shenkottah taluk of Tirunelveli district)
- Panchama
- Pannadi
- Panniandi
- Parai yan, Parayan, Sambavar
- Paravan (in Kanyakumari district and Shenkottah taluk of Tirunelveli district)
- Pathiyan (in Kanyakumari district and Shenkottah taluk of Tirunelveli district)
- Pulayan, Cheramar
- Puthirai Vannan
- Raneyar
- Samagara
- Samban
- Sapari
- Semman
- Thandan (in Kanyakumari district and Shenkottah taluk of Tirunelveli district)
- Thoti
- Tiruvalluvar
- Vallon
- Valluvan
- Vannan (in Kanyakumari district and Shenkottah taluk of Tirunelveli district)
- Vathiriyan
- Velan
- Vetan (in Kanyakumari district Shenkottah taluk of Tirunelveli district)
- Vettiyan
- Vettuvan (in Kanyakumari district and Shenkottah taluk of Tirunelveli district)
List of Tamil Nadu Scheduled Tribes
- Adiyan
- Aranadan
- Eravallan
- Irular
- Kadar
- Kammara (excluding Kanyakumari district and Shenkottah taluk of Tirunelveli district) (c)
- Kanikaran, Kanikkar (in Kanyakumari district and Shenkottah taluk of Tirunelveli district) (a)
- Kaniyan, Kanyan
- Kattunayakan
- Kochu Velan
- Konda Kapus
- Kondareddis
- Koraga
- Kota (excluding Kanyakumari district and Shenkottah taluk of Tirunelveli district) (c)
- Kudiya, Melakudi
- Kurichchan
- Kurumbas (in the Nilgiris district) (b)
- Kurumans
- Maha Malasar
- Malai Arayan
- Malai Pandaram
- Malai Vedan
- Malakkuravan
- Malasar
- Malayali (in Dharmapuri, North Arcot, Pudukottai, Salem, South Arcot and Tiruchirapalli districts) (d)
- Malayekandi
- Mannan
- Mudugar, Muduvan
- Muthuvan
- Palleyan
- Palliyan
- Palliyar
- Paniyan
- Sholaga
- Toda (excluding Kanyakumari district and Shenkottah taluk of Tirunelveli district) (c)
- Uraly
a. The entry is to be read as "in Kanniyakumari district and Shencottah taluk of Tirunelveli district".
b. The entry is to be read as "in the Nilgiri district".
c. The entry is to be read as "excluding Kanniyakumari district and Shencottah taluk of Tirunelveli district".
d. The entry is to be read as "in Dharmapuri, Vellore, Tiruvannamalai, Pudukkottai, Salem, Namakkal, Villupuram, Cuddalore, Tiruchirappalli, Karur and Perambalur districts".