OpenNEXEN · AI study partner

Your study partner for the BacII exam.

A free AI tutor dedicated to Cambodia's Baccalaureate II math exam. Ask a question, work through past papers, and practice at your own pace.

Try it now See how it explains

Beta · Free · Math · English and ខ្មែរ

LUMINA3ai logo, a glowing blue summation symbol
students reached across Cambodia
3,000+
BacII math papers covered
2014–2024
Khmer support is in beta
English · ខ្មែរ
for every student
Free
How it explains

One step at a time.

Answers are worked the way you'd write them in the exam, using only methods the exam allows.

  1. Start with the antiderivative. Raise the power by one and divide by the new power.
  2. Simplify. The 2 in front cancels with the 2 you divided by, leaving x².
  3. Add the constant. An indefinite integral is a whole family of functions, so it ends with + C.
  4. Check your answer. Differentiate x² + C and you get 2x, the expression you started with.
Problem ∫ 2x dx
1 ∫ 2x dx = 2 · x²2
2 = x²
3 = x² + C
4 d/dx (x² + C) = 2x
Illustrative walkthrough · written by us, not a live session
Features

Everything you need to prepare

LUMINA3ai currently focuses on math, and is built around how the BacII exam is actually written.

  1. 01

    Ask BacII-style questions

    Get clear, step-by-step explanations in a calm, encouraging tone, using only methods allowed in the exam.

  2. 02

    Explore past exams

    Work through papers from 2014 to 2024. Ask it to solve a section or explain how a type of problem is approached.

  3. 03

    Generate exercises

    Ask for practice questions on any topic or any year's exam style, then check your thinking as you go.

  4. 04

    Personalized study plans

    Tell it what you struggle with and how much time you have, and it will help you plan your revision.

Why we built it
"By Cambodian Students.
For Cambodian Students."

Many Cambodian high school students struggle to find the academic support and study materials they need for the Baccalaureate II exam. Some can't afford extra tutoring, while others don't have the time or resources to get the same help as their peers.

As high school students ourselves, we saw this problem up close and wanted to change it. That's why our team at OpenNEXEN created LUMINA3ai, a free and accessible AI study assistant made to support every student.

Recognition LUMINA3ai was selected by the Ministry of Education, Youth and Sport (MOEYS) to be presented at the 2025 Cambodia EdTech Conference.
Get started

Not sure what to ask?

Try one of these. Ask in English or Khmer, and LUMINA3ai answers in the language you use.

English "Solve section III on the 2023 exam." "Explain how to do integrals." "Explain how to solve limits based on the 2022 exam."
ខ្មែរ "ដោះស្រាយលំហាត់រ៉ូមាំងទី III ក្នុងប្រធានវិញ្ញាសាឆ្នាំ 2023" "ពន្យល់ពីរបៀបដោះស្រាយលំហាត់អាំងតេក្រាល" "ពន្យល់ពីរបៀបដោះស្រាយលីមីតដោយយកប្រធានឆ្នាំ 2022 ជាគំរូ"
Under the hood

How does LUMINA3ai work?

LUMINA3ai is built on the ChatGPT API, using gpt-6-luna as its backbone, with instructions tailored to the BacII exam.

Modelgpt-6-luna (ChatGPT API)
SubjectMathematics · BacII
LanguagesEnglish, Khmer (beta)
Built byOpenNEXEN ↗
StatusBeta
Beta notice LUMINA3ai is still in beta, so there may be bugs, and it can make mistakes. Switching to gpt-6-luna has drastically improved Khmer support, but it isn't fully reliable yet and we're working on it. Check with a teacher if you are unsure.

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