Hello aspirant. Every year NTSE doesn't release any syllabus in specific. As in nothing called official syllabus will be released. Basically 2 papers. MAT and SAT. MaaT usually itself will be based on quantum logic and reasoning. SAT consists of maths, science and social. NCERT books of class 9th and 10th, preparing them would be more than enough.

Nothing called quantitative ability in specific. Already embedded inside MAT part

Hope this helps

Regards

Nikhitha