hey ajay

there are lots of colleges in the states you are alking about which provides bsc mathematics honours

first i will tell you about colleges in delhi . in delhi DU is the best choice .it is one of the india's most prestigious universities .so look out for best colleges under du .check out this link

http://duupdates.in/best-colleges-b-sc-mathematics-delhi-university/

also there are many good colleges in haryana .here is the list of colleges go through this and check out the coleges of your desire

https://collegedunia.com/bsc/haryana-colleges

best wishes