Vocational school students are expected to be capable of doing
understandable conversation which is supported by good grammar mastery.
However, grammar mastery is still a problem since vocational school students are
not able to use such particular part of grammar namely tenses eventhough they are
in the form of simple tenses such as simple present tense, simple past tense, and
simple future tense. The problem is caused by perception that tenses are difficult
and boring materials. Therefore, index card match is interesting and helpful
technique which is proposed to overcome the problem. The aim of the research is
to prove whether index card match is able to improve students’ grammar mastery
or not. The results of the research prove that index card match is an appropriate
technique to improve students’ grammar mastery. The results of the test indicated
improvement 5.3% in post-test I and 40.9% in post-test II. Moreover, index card
match improved students’ activeness which indicated 53.2% of total
improvement. Furthermore, teacher’s performance improved which indicated
13.3% improvement. Additionally, the results of questionnaire which represented
whole students’ perception indicated 98.5% of students agreed with the six
statements about the usefulness of index card match. The results of the research
imply the success of index card match in improving students’ grammar mastery