TRINITY MATHSLAB
KOENExplore maths practice

TRINITY MATHSLAB / SERVICES

Services built by founder Sungmin Kim

What you can open today and what is still in preparation, each with its status.

  1. 111sm

    Status: In public beta · full service due 14 December 2026

    Students solve past papers and topic questions, mark answers read from their handwriting, and retry only what they missed, in the browser or the iPhone, iPad and Android apps.

    Open 111sm.app Get the iPhone and iPad app on the App Store Get the Android app on Google Play

  2. Trinity Press

    Status: Due 14 December

    Essence for concepts, Solid for drills, Target for problem solving. One manuscript produces the printed book, the lesson slides and the app questions.

    See the line-up on the company page

  3. mathskim

    Status: Live

    Sungmin Kim’s personal brand. Two free books and a maths question channel introduce the thinking behind the teaching.

    Meet the teacher and author

  4. Study habit check

    Status: Live

    Think about how you have been studying lately and answer five questions. You get a suggestion of what to look at first, whether linking concepts, pacing, or reviewing mistakes, and a way to practise it.

    Take the check

Also in Korean

These are in Korean only.