Etest JAMB CBT
Timed practice for JAMB, Nigeria’s university entrance exam: past questions with explanations and a study plan.
Live on the App Store and Google PlayI build mobile apps and exam platforms from Lagos.
I’m John Osakwe, an independent developer in Lagos, and Etest Tech Hub is my studio. I’ve built apps and websites for clients since 2015. Etest JAMB CBT, FizzFree and Pawlarm are my own apps, live on the App Store, and the first two are on Google Play too. I built and published all three, and each has a write up of how.
Lagos, Nigeria. I take clients in the US, UK, Canada, Australia, Europe and Nigeria, and I set call times in your time zone.
- Building apps and websites since 2015
- 100+ projects delivered
- 200+ clients served
What I build for clients
Four services, priced in US dollars. Projects start at $2,500. SEO retainers start at $1,200 per month, three month minimum. The final number comes in a written quote before I start.
- 01
Mobile apps
Mobile app development in LagosiOS and Android apps, from first sketch to the App Store and Google Play.
From $6,000.
- 02
Exam platforms
CBT exam platform developmentCBT, short for computer based test, and exam software for schools, exam prep centers and students.
From $8,000.
- 03
Websites
Website design in LagosReact websites that send search engines the full text of every page.
From $2,500.
- 04
SEO services
SEO services from $1,200 a monthTechnical fixes and content structure for sites that should be on Google and aren’t.
From $1,200 per month, three month minimum.
Apps I published
Three apps I published as my own. Each has a page with what I built and what I decided.
FizzFree
A tracker for people quitting or cutting down soda and energy drinks. No account needed.
Live on the App Store and Google Play
Pawlarm
A pet care reminder app for dogs and cats.
Live on the App StoreSites and platforms I build and manage
Some of my work isn’t an app in a store. These are the sites and platforms Etest Tech Hub builds or manages.
- eliteplanners.ngMy own site: Nigerian event planning guides, price guides and a cost calculator.eliteplanners.ng SEO case study
- Manna AIA weekly meal planner for iOS and Android. I built both apps and I look after updates and maintenance.Manna AI case study
- EmailSparkA project I founded. It is live.
- ESSMRTA platform I manage for the Edo State government.
- SNDIA platform I manage for a Nigerian government official.
- MitotechA platform I manage for a real estate company.
How a project runs
- 01
Discover
We talk about the problem, the users and the budget. I tell you what I’d build first and what I’d leave out.
- 02
Design
I draw the screens or pages, and you react to them before I write any code.
- 03
Build
I write the app or site and send you working builds along the way, so you’re testing the real thing.
- 04
Launch
For an app, I prepare the App Store and Google Play listings, submit the builds and answer the reviewers if they have questions. For a website, I put it live on your domain.
- 05
Support
After launch I fix what breaks. What’s covered, and for how long, is written in your quote.
How I build
Tools I’ve shipped with, and nothing I’ve only read about.
- React
- React Native
- Expo
- TypeScript
- Vite
- Capacitor
- Tailwind CSS
- Firebase
- Supabase
- RevenueCat
- AdMob
Python, for automation work.
Why I publish my own apps
I started building apps and websites for clients in 2015. Since June 2026 I’ve also released five apps of my own on the App Store, and three of them are written up on this site.
Publishing them put me through everything your app would face: setting up subscriptions in RevenueCat, writing store listings, preparing screenshots and privacy pages, and answering App Store review questions. When you hire me for an app, I’ve done each of those steps recently, on my own products.
It also changes how I advise you. I’ll tell you plainly when an idea is too big for a first version, because I’ve cut features from my own apps to get them out.
John Osakwe, founder, Etest Tech Hub
Games in development
Three games are in development: Bus Spin, Cipher Isles and Relicfall.
Bus Spin
Traffic jam puzzle with 150 levels.
Coming soon
Cipher Isles
Decode a lost language and repair a wrecked ship.
Coming soon
Relicfall
A tactical idle game in a drowned ruin.
Coming soonFrom the blog
Notes on exam prep, habit apps and building software in Nigeria. I write them from work I’ve done.
Building apps and platforms in Nigeria
CBT Software Development Nigeria: Build for a School
A school CBT platform is a question bank, a timer, a scoring rule and a plan for the day the network fails. Here is how I would build one, and what Etest JAMB CBT taught me.
Pets and consumer apps
Dog Vaccine Schedule: Puppy to Adult Timeline
Core and noncore vaccines, how puppy shots are spaced, when boosters come and why rabies follows local law. General information to take to your vet.
Quit soda and habit health
How Much Sugar Is in a Can of Soda: Grams, Teaspoons
A regular 12 oz can of cola has about 39 grams of sugar. Here is what that means in teaspoons, against daily limits, and over a week and a year.
Questions people ask before they write to me
How much does a mobile app cost?
A mobile app MVP starts from $6,000, an exam or CBT platform from $8,000 and a website from $2,500. Those are starting prices for one agreed scope. After we talk, you get the exact number in writing.
Do you work with clients outside Nigeria?
Yes. I’m in Lagos and I work with clients in the US, UK, Canada, Australia and Europe as well as Nigeria. We talk by email, WhatsApp or video call, and I pick call times that work in your time zone.
Who owns the code?
You do. You own the code and the assets once the project is paid for.
Who will I be talking to?
Me. I answer every email myself, usually within one business day.
Can you show me something you’ve already built?
Yes. Etest JAMB CBT, FizzFree and Pawlarm are on the App Store and you can download them today. Each has a case study covering what I built.
How much does it cost to build a CBT app in Nigeria?
An exam or CBT platform starts from $8,000. The CBT page explains what moves the price.
Tell me what you want to build.
Send me a few lines. I’ll tell you whether I’m the right person for it, and if I’m not, I’ll say so.