The third proficiency group was the high group. The three strategies, "grouping, imagery and highlighting", were most helpful to remember words in short-term test while, "grouping, imagery and non-linguistic clues", were the top ranking strategies in the long-term retention test. From the above data it can be concluded that generally non-linguistic clues can be an effective strategy for high proficient students in long-term retention test. Further, grouping was an effective strategy for all proficiency level participants.