5 students: A, B, C, D and E. From statement I: B and C reached school together. We cannot determine the last student. So, the data in statement I alone is not sufficient to answer the question. From statement II: Only D reached school ahead of C. D, C We cannot determine the last student. So, the data in statement II alone is not sufficient to answer the question. By combining I and II D, (B, C), E / A Either E or A will reached the school last among the students. We cannot determine this from the statements. Hence, the data even in both statements I and II together are not sufficient to answer the question.