Article 254 is the specific provision for resolving Central-State law conflicts on Concurrent List subjects. The rule: Central law prevails unless the State law received Presidential assent before the Central law was enacted.

1. 1 Pick up Constitution.
2. 2 Check Article 248 → residuary powers. Not this.
3. 3 Check Article 252 → power of Parliament with consent of states. Not this.
4. 4 Check Article 254 → 'Inconsistency between laws made by Parliament and laws made by the Legislatures of States.' ✓ Found it.
5. 5 Article 256 → obligation of states. Not this.

The text reads: Article 254: If a state law is repugnant to a parliamentary law on a Concurrent List subject, the state law shall be void to the extent of repugnancy. Exception: state law prevails if it received Presidential assent.