HSC/Undergraduate All Students - I built an educational operating system that does not hallucinate - 300k++ questions. Free month, roast it! (1 Viewer)

[StemDev_AU]

I'm Alan, 25+ years in IT. Last year I got frustrated watching my kids struggle with AI tools that give confidently wrong answers. So I spent 15 months building something different. Inspired by open educational resources (OpenStax) and the disruptive AI tech.

I didn't wrap ChatGPT. I built a 9-stage validation pipeline that runs 24/7 on enterprise servers, generating and cross-verifying 5,000 questions per day using 5 different AI models (Gemma3 27B, DeepSeek, Claude, Haiku) that "blind solve" against university-standard OpenStax textbooks.

My platform is not a database - it is an educational operating system, it teaches.

The platform is called Nexus Education. It's live. It's in beta. And I need HSC students to break it.

What makes this different?

1. It tells you WHY your answer was wrong

Most platforms: "Wrong. The answer is C."

Nexus: "You selected 24. I suspect you forgot the ½ factor during u-substitution. Here's where that happens in your working..."

Our diagnostic engine analyses the specific distractor you chose and explains the logic trap you fell into.



2. It generates similar problems on-demand

Reading solutions is passive. Doing problems is active.

Get a question wrong? Click "Show me a similar worked example" and the engine instantly generates a brand new problem (same concept, different numbers) so you can prove you understand the method.



3. It actually marks short answer questions

Most platforms can't handle extended response. Ours can.

• Real-time LaTeX helper highlights syntax errors as you type (like a code editor for math)
• Rubric-based marking gives you detailed breakdown of Strengths, Weaknesses, and Alignment
• Not just a score—actual feedback on your working

4. The STEM question bank is absurd

Currently 100,000+ validated questions across Maths, Physics, Chemistry, Biology, and Earth Science. By end of January: 350,000 including short answer and flashcards.

• Maths Ext 2: 430+ questions on Integration Techniques alone
• Physics: 411+ questions on Electromagnetism
• Biology: 350+ questions on Cardiovascular Systems
• Chemistry: Complete coverage of Organic Chemistry mechanisms
• Earth Science: Full geological processes and environmental systems

Every question is grounded in OpenStax textbooks (the same open-source content used by MIT and Stanford). Not generic AI knowledge—actual curriculum.



5. Upload your own notes

Doing Ancient History? Economics? Business Studies?

Upload your PDFs/Word docs. We parse them, semantic-search the content, and generate HSC-style MCQs and flashcards specifically for your school assessments.

Bonus: Select multiple textbooks (e.g., Biology + Physics) and the AI Tutor explains concepts using both perspectives. Studying "The Ear"? Get anatomy AND sound wave physics simultaneously.

The technical bit (skip if you don't care):

• Infrastructure: Dell R750 servers (dual Xeon, 512GB RAM, NVIDIA Enterprise GPUs)
• Content: 40,000+ pages of OpenStax textbooks processed through RAG
• Validation: 9-phase pipeline catches errors that single-model systems miss
• Prompts: 35,000+ engineered pedagogical prompts across 12 subjects
• Philosophy: Built on open knowledge to create global educational equity

Pricing (no BS):
First month: 100% FREE. Full access. No restrictions. No credit card required.
After that:

• Student: $25/month (cancel anytime)
• Tutor/Teacher: $45/month (includes 5 student accounts)

Special for BoS: First 20 users to DM me feedback get 3 months free with special code!

Why I'm posting here:
I need real HSC students to test this properly. If you find:

• Wrong answers
• Bad explanations
• Broken features
• AI hallucinations

I want to know. Reply here or DM me. I'm monitoring this thread and will respond fast.

Challenge: Find a mathematically incorrect answer in the STEM bank, show me the evidence, and I'll give you an extra month free access. (Serious. I've validated 90K questions—I'm confident, but not cocky.)

Try it: (search nexus-edu.ai)

Sign up takes 30 seconds (passwordless authentication). No credit card. Full platform access immediately.

Questions? Ask here. I built this solo over 15 months—I know every line of code and can answer anything.

Let me know what you think. And please, try to break it.

—Alan

 

[SS173]

Why did you choose the name Nexus Education ? There are a lot of other sites with the name Nexus Education ...

 

[StemDev_AU]

There are a few I agree. In hindsight something more unique would have been more appropriate - however, check us out and you will see we are only the same in name only!!

 

[carrotsss]

Using Gemma3 27b for this sort of thing is an interesting choice, it’s a good model for some use cases but I’ve found it pretty terrible for anything scientific/mathematic. Also don’t really understand what you mean by using both Claude and Haiku, I’m assuming Claude Haiku which is one model? I also wouldn’t really trust Haiku for maths, having a textbook is one thing but for maths problems you generally need thinking time and to a lesser extent, model size, not really facts. And also curious what level of DeepSeek distillation & quantisation you used, anything other than full size 671b thinking is imo not enough for this sort of thing

I’ll have to test but I’d be interested to see if you actually managed to restrict it to the actual HSC syllabus, usually AI models either go beyond the syllabus or when properly restricted to one, stick to really simple questions/not HSC-style.

 

[StemDev_AU]

Typo - Claude and Haiku, should say Sonnet4.5, Opus and Haiku.

I have a multi model validation pipeline - each model serves its purpose, as well as manual validation. In my experience the prompt engineering is just as important - I have bespoke prompts for every iteration (subject/stage/difficulty/modal/pedagogy and model). All of my content is also generated against a full RAG pipeline.

My platform is meant to be global - it does not restrict itself to HSC syllabus, however there is a significant cross over when compared to an HSC or a UK based syllabus for Year 11/12 stem or University undergraduate courses.

 

[StemDev_AU]

To show an example for short answer exams - this would be a stage 6 Mathematics question onLogs and exponentials (I hated these!)

Question:

No answer was sumitted to this question just to show the response of the system:

Any the full working solution: sorry two pages due to the detail:




This could go one step further which is the help function: this time we will go with "Show me a similar worked example"



We have dynammic creation and marking for all stem subjects.

Any questions ping me!