Merit based and entrance based admission are the two main ways colleges select students, and the difference simply comes down to whether your board marks or a separate exam decides your admission.
In merit based admission, colleges select students directly on their Class 12 board marks. A cut off percentage is announced, and if your marks meet it, you get in. This rewards consistent performance across the board year and is common at many degree colleges.
In entrance based admission, your admission depends on your score in a specific entrance exam, such as JEE, NEET, CLAT, or CUET. Here your board marks may only need to meet a minimum eligibility, and the exam score does the real selecting.
The practical difference is where you should focus. For merit based colleges, your board marks are everything, so consistent study across the year matters most. For entrance based colleges, you must prepare seriously for the specific exam alongside your boards.
Many students face a mix, needing both good board marks and a strong entrance score, so it helps to know which colleges use which system.
Example: A student aiming for a merit based college focused fully on maximising her board percentage, while another targeting an entrance based course balanced boards with dedicated exam preparation.
One practical tip: Find out early whether your target colleges are merit based or entrance based, because that decides whether you should pour your energy into board marks, exam prep, or both.