Remember, amigos, we present you with authentic Spanish here at LoMásTv, and Taimur is a second grader auténtico, which means our young friend is entitled to make a grammatical mistake or two himself, ¿verdad? (Not to mention that Spanish is also his second language.)
In caption 16 of "Taimur Sings" he says Soy muy estudiantil, and, similarly, you may have noted that in "Taimur Talks" he states yo soy muy estudiante. It's clear that Taimur enjoys school and studies hard, and no doubt his teachers and parents notice that él es un estudiante muy estudioso ("He is very studious student").
The word estudiante is the noun for "student," so Taimur probably should have said Soy un buen estudiante, "I'm a good student." Or he might have chosen to tell us Yo soy muy estudioso, "I am very studious."
The word estudiantil is the adjective for "student," so a student run organization is an organización estudiantil, students who travel are engaging in turismo estudiantil, between classes young scholars might relax in a sálon estudiantil, and students who protest, if they have an effective leader, might create a full-fledged movimiento estudiantil.