There should be basically 2 time tables as per your convenience- One is study and the other is daily routine time table which includes your study timings as well but is not dedicated to study planner. NTSE has three sections MAT , SAT and LAT.
Here are some preparation tips you can follow:

Read NCERT books as it will be very helpful for the exam.

Go through with previous year papers to take an idea about the exam.

Make a time schedule topic wise & section wise, It will help you to cover all the entire syllabus.

Join Mock test, to analyze your performance & work on th eweak areas after each Mock test.

Do practise as much you can it will help you to have strong preparation for the exam.

Good luck!