TEST OF MATHEMATICS AT 10+2 LEVEL consists of previous years b.stat question papers

it is available at SARASWATI PUSTAKALAYA (Behind ISI Kolkata).

About no. of seats in ISI

According to the dean of students, ISI, Bimal K Roy

"The institute has no seat constraints and the number of candidates enrolled in any course depends on the number of students who qualify the entrance examination."
source:http://www.expressindia.com/latest-news/ISI-sees-a-decline-in-number-of-students-opting/308407/

ABOUT ISI

Indian Statistical Institute, the prestigious university  par with IITs, IIMs, .................

But few people  know about it. Though, the scenario is changing in the recent times.

 More and more students,are becoming aware about it and testing their mettle in the

 challenging admission test which aims to select only the crème de la crème throughout India. 

Unique of its kind in India, ISI enjoys autonomy under the Ministry of Statistics and Programme Implementation.

 There are few advantages over all other educational institutions in india _there is no tuition fee.In addition u get thousands in d form of stipends (unless u perform extremely poorly). It offers hostel facilities to all students at extremely nominal charge(order of 2 per month). Also, there are book grants  and prizes for toppers. The number of students in a stream is small – around 50, which leads to an environment of healthy competition.