The aptitude will be really simple and will be more general, nothing more than its 11th or 12th mat, PHY, chem. There are many websites and applications available where you can prepare for fitness.
The interview questions will also be general or based on your personal data, as if you were asked to talk about your place of origin, about your school and other similar types.
Now you will give more weight to the cutting marks of your twelfth board and the fitness and interview only have a lower weight. The aptitude and interview scores are used as decision-makers in case of a tie between the students with the same general qualifications when deciding the rank.