What's up, Jess !
Are you teaching British or American English ? I ask because in American English, the two most used tenses are the PRESENT and the PRETERITE (passé simple). As you know, the rest of the so-called tenses are formed with auxiliaries.
Since your student is bound by his/her classroom curriculum, your lessons will be pretty much decided by the homework and tests given to the student by the teacher.
I also have a student (from Colombia). At the present time, I've been teaching her how to answer and ask questions in English.
First I taught her how to answer questions (short answer and long answer) because it's easier. Now I'm teaching her how to ask questions, which is decidedly more difficult.
You could probably build your lessons around the material in your student's classroom textbook, if he/she has one.
I have much more to say, but I'll wait until you contact me again. Bon courage.