Hello,

If you're aiming for BStat or BMaths in ISI then let me inform you that there is no upper age limit regarding this, as long as you fulfill the eligibility criteria you can appear for the entrance test as follows-

Candidates are required to pass 10+2 from a recognized board with English and Mathematics,

When it comes to exam pattern of BStat or BMath then both will be conducted in two sessions,

BStat and BMath: Paper I will be conducted in the forenoon slot in MCQs format, while Paper II in afternoon as descriptive type questions, there will be a total of 30 MCQs and there is negative marking scheme, both the papers will be of Maths,

you can check out the FAQs section pertaining to admission at https://www.isical.ac.in/~admission/Documents/IsiAdmission2020/Application-FAQs-2020.pdf

You can also visit the official website at https://www.isical.ac.in/content/ug-admission in case you wish to know about any more detailed information pertaining to any of the course or entrance test for that matter.