The 7 Categories and Their Percentages
| Code | Category | Reservation % | Notes |
|---|---|---|---|
| OC | Open Competition | 31% | NOT a community — open to ALL; best general ranks fill these |
| BC | Backward Classes | 26.5% | 100+ castes listed by TN Govt |
| BCM | Backward Classes (Muslim) | 3.5% | Muslim communities |
| MBC | Most Backward Classes + DNC | 20% | MBC and Denotified Communities share this pool and same code |
| SC | Scheduled Castes | 15% | Includes SCA sub-quota within it |
| SCA | Scheduled Caste Arunthathiyar | 3% | Sub-quota within SC 15%; unused seats convert to SC |
| ST | Scheduled Tribes | 1% | Constitutional |
| Total | 100% |
OC = Open Competition, NOT a Caste
This is the #1 misunderstanding in TNEA.
The 31% "OC seats" are open competition seats — the best-ranked candidates from ALL communities (including SC, MBC, BC) fill these first. An SC student with Rank 500 will get an OC seat at CEG. A Brahmin-origin student competes in the OC pool because they are not listed in any BC/MBC/SC category.
COMMUNITY vs ALLOTTED COMMUNITY — How to Read Your Allotment
Every allotment order shows two community columns. This confuses students every year.
| Column | What It Means |
|---|---|
| COMMUNITY | YOUR community as registered (e.g., MBC) |
| ALLOTTED COMMUNITY | Which reservation pool your seat came from (e.g., OC) |
Real-world examples:
| Student's Community | ALLOTTED COMMUNITY | What Happened |
|---|---|---|
| SC | OC | SC student's general rank was strong; got an open competition seat — GOOD outcome |
| MBC | MBC | MBC student got a seat from MBC reserved pool — normal |
| BC | OC | BC student competed in open pool; strong rank — GOOD outcome |
| OC | OC | Standard — OC-origin student in open competition pool |
Getting "ALLOTTED COMMUNITY: OC" when you are SC or MBC is not an error — it means you earned a competitive seat.
Creamy Layer Rules
| Category | Creamy Layer? | Condition |
|---|---|---|
| BC | ✅ YES | Annual family income must be ≤ ₹8 lakh to claim BC reservation |
| BCM | ✅ YES | Same — ≤ ₹8 lakh |
| MBC / DNC | ✅ YES | Same — ≤ ₹8 lakh |
| SC | ❌ NO | No creamy layer; all SC qualify regardless of income |
| SCA | ❌ NO | No creamy layer |
| ST | ❌ NO | No creamy layer |
If BC/MBC income exceeds ₹8 lakh, the student must compete in the OC pool.
Certificate Issuing Authorities
| Category | Who Issues | Level |
|---|---|---|
| OC (no reservation needed) | Tahsildar | Mandal |
| BC / BCM / MBC / DNC | Revenue Divisional Officer (RDO) | Sub-district |
| SC / SCA / ST | Revenue Divisional Officer or Sub-Collector | Sub-district |
Tahsildar-issued community certificates are rejected for BC/MBC reservation claims. Get RDO-level certificates before registration opens.
MBC and DNC — Same Code, Same Pool
- DNC (Denotified Communities) candidates register under the MBC code in TNEA
- There is NO separate DNC rank list or DNC seat matrix
- Both MBC and DNC candidates compete from the same 20% pool
- Community certificates will say "MBC" or "DNC/BC" — both are valid
SCA to SC Conversion — Post Round 3
After all 3 general counselling rounds close:
- Unfilled SCA (3%) seats are converted to SC seats
- Offered to SC candidates without seats in a mini-round called SCA to SC Counselling
- This is a separate process after main rounds end
