Preparing for both in one year
Use JEE-level concept work in Physics and Maths as the base; it covers the IMU CET science with margin. Add twenty to thirty minutes most days for English, quantitative aptitude and general awareness, including maritime awareness. Sit IMU CET-pattern mocks under IMU CET timing from the second half of the year, and JEE mocks under JEE timing, separately.
Decide the priority early. If the sea is the goal, IMU CET is the milestone and JEE is the backup; if an engineering seat on land is the goal, the reverse. Families who leave the decision to April usually under-prepare for both. NavPath coaches for IMU CET only, and says so plainly, so that JEE-first students can plan honestly.