IITs and NITs follow one reservation system. Tamil Nadu government colleges follow a different, more detailed one. Getting this right changes which rank or score actually gets you a seat.
This hub explains how the system works in practice for JEE and NEET admissions — factually, so you can plan accurately. It does not take a position for or against reservation policy.
Governed by the Central Educational Institutions (Reservation in Admission) Act, 2006, and the 2019 EWS amendment.
| Category | Reservation % | Basis |
|---|---|---|
| OBC-NCL | 27% | Article 15(4) + CEI Act 2006 — Non-Creamy Layer only |
| SC | 15% | Article 15(4) + Article 46 |
| ST | 7.5% | Article 15(4) + Article 46 |
| EWS | 10% | 103rd Constitutional Amendment (2019) |
| General (unreserved) | 40.5% | Merit-based, open to all |
One of India's most detailed state systems — and higher overall reservation than the central norm.
| TN category | Reservation % | Notes |
|---|---|---|
| BC | 26.5% | Largest single reservation block in TN |
| BCM | 3.5% | Backward Classes (Muslim) |
| MBC + DNC | 20% | More disadvantaged than BC; includes Vanniyar, Nadar (non-Christian) and others |
| SC | 18% | Higher than the central 15% |
| SCA | 3% | Sub-quota within SC, for Arunthathiyar community only |
| ST | 1% | Lower TN tribal population than other states |
| OC (Open Competition) | ~31% | Merit-based, all communities compete |
Reservation percentages are subject to ongoing litigation and court orders — always verify the current operative figures at tneaonline.org or tnmedicalselection.net at counselling time.
What "Non-Creamy Layer" means, the ₹8 lakh threshold, and Central vs. TN OBC lists.
explore →No creamy layer, no income criterion — certificate requirements and central + TN benefits.
explore →The 10% category for General-category students under the income and asset thresholds.
explore →The 5% horizontal reservation that runs across every vertical category.
explore →BC, MBC, DNC, SC, SCA — how each TN-specific category actually works.
explore →Why your category rank — not your overall CRL — is what JoSAA actually uses to fill reserved seats.
explore →| Misconception | The reality |
|---|---|
| "OBC students don't need to study hard" | OBC-NCL closing ranks for top IIT CSE seats typically fall in the 3,000–8,000 range — still extremely competitive. |
| "My TN BC certificate works for IIT/NIT" | Not always — you need a separate Central OBC-NCL certificate for central institutions. |
| "Creamy layer applies to SC/ST too" | No — there is no creamy layer for SC/ST. It applies only to OBC-NCL. |
Not automatically. Central institutions (IITs, NITs, AIIMS) go by the Central OBC list, which is separate from Tamil Nadu's state BC list. Many TN BC/MBC communities are on the Central list too, but you need a separate Central OBC-NCL certificate — not just your TN BC certificate — to claim the benefit at JoSAA or MCC.
Creamy layer excludes OBC-NCL candidates whose family income exceeds ₹8 lakh/year — above that threshold, they compete as General category for central institutions. Critically, creamy layer does NOT apply to SC/ST — students in those categories qualify for reservation regardless of family income.
No. EWS is specifically for General-category students (not SC/ST/OBC) with family income under ₹8 lakh/year and specific asset limits. A BC, MBC, SC, or ST student with a low income does not claim EWS — they use their own category, which usually carries a larger reservation share and lower cutoffs.
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Coming soonA counsellor can map your category to exactly what to apply for, and when.