how may i solve seating arrangement,puzzles and inequalities

just practice a lot!!
don't go with hard puzzles at first!!
try some easier ones and try to understand the concept!!
once you are strong in solving some easy ones go for some medium ques and tough ones...
in exam don't worry about rough sheet getting used a lot...legibly jot the points down ..direct clues will be given so mark those st away..with those clues represented on ur rough sheet u can easily get the exact answer for puzzle ...if u dont have any direct clues and find the clues tougher its better to leave as these exams test ur smartness and not your ability to crack those...