In the Philippines, English has always been the second language. From elementary school to college, it has been taught. One of the courses in college is Criminology. In order to become a police officer, students must have all the necessary skills. Criminology students need to know English so they can talk to people, get jobs, and write reports. Still, speaking is a hard part of learning a language for these students. To write a good speech, one need to know about grammar, spelling, punctuation, and vocabulary. So, the goal of this study is to look into how criminology students can use micro videos in the Tiktok app to improve their speaking and grammar skills. Tiktok app is a video streaming social media site. The respondents who took part in this study were 16 criminology students from a private school in Misamis Oriental taking a foreign language class - English. The study took place over 7 weeks and used a single pre-experimental design. The respondents took a pre-test and a post-test, which were compared using the T-test. Then there was an FGD, during which open-ended questions were asked. Findings show that Tiktok videos help students improve their speaking skills and grammar skills. This study shows that English teachers should use the Tiktok app to make short videos to help their students improve their speaking and grammar skills. Students can improve speaking and grammar skills because of Tiktok application.

micro-videos, Tiktok, Grammar Skill, Speaking Skill, Criminology students