Hello Astha,

A few tips which might help.
1. Stop worrying about the time left and make the best use of the time at hand. You still have 45 days available with you.

2. Start practicing: In this time, solve as many relevant sample papers as you can. You can start with NTSE Brainstorm which offers 7 full length sample papers and 50,000 MAT quesitons for practice.
schoolcountry.com/.../...torm_Practice_Papers.aspx

3. Try and identify your strength areas. It is important to know areas where you have high accuracy and also take less time to do. For example, you may have a high accuracy in "orientation" and "data interpretation" problems. Also you might be doing these questions faster. But geometry might not be so strong. Then on the day of the exam, you need to make sure that you attempt all the questions on "orientation" and "data interpretation" to maximize your score. NTSE Brainstorm will help you identify your strong and weak areas.

4. Do practice MAT: NTSE has 90 questions in MAT and 90 in SAT. Make sure to give appropriate time to MAT. People often give disproportionate time to history or civics while it is only 10% of the total marks. But ignore MAT which has 50% weightage