Hello
There are various undergraduate courses you can opt for in statistics subject after class XII. Some of them are

• Bachelor of Science (Hons) in Statistics
• Bachelor of Arts in Statistics
• Bachelor in Statistics

All of these are 3 years courses.
The admissions are provided on the basis of entrance examination conducted by various universities or the marks secured in class XII.
Top colleges/universities for these courses are

• University of Delhi
• Ferguson College, Pune
• Madras Christian College, Chennai
• St. Xavier's College, Ahmedabad
• Indian Institute of Management and Commerce, Hyderabad

Good luck