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To secure a rank under 100 in the ISI Admission Test for the B.Math or B.Stat program, you typically need a high score, as the competition is intense. While the exact marks required can fluctuate depending on the difficulty level of the exam in a given year, scoring around 70% or higher is usually necessary to rank under 100.

However, achieving this can be challenging because the ISI Admission Test consists of two parts:

1. Part 1: Multiple Choice Questions (MCQ)
2. Part 2: Descriptive/Subjective Problems

Both parts assess strong mathematical problem-solving abilities, and since the total number of candidates is large but the intake is limited, a high percentile is required.

The cutoff scores for admission and ranks vary, so to achieve a rank under 100, strong preparation across all topics, such as algebra, calculus, geometry, and combinatorics, is essential.