Who has secured the maximum marks among six friends A B C D E and F ? Statements I. B secured less marks than that of A and F but not less than C D and E. II. F secured more marks than B but not as much as that of A '

Data sufficiency questions are designed to check your ability to analyse & categorise information based on underlying concepts rather than calculations. So you should try to observe -  analyse and to find linkages between various statements rather soing lengthy calculations.