NMMS exam is a 3 hour exam with 180 marks total.The syllabus consists of social science maths and science.In part 1 mental ability test Mental ability,hindi,english questions are asked and in part 2 Scholastic Aptitude Test (SAT) Science, social studies and mathematics.For seeing the mark distribution and the full topics you can visit this link-

https://school.careers360.com/articles/nmms-exam