Competitive Exam Prep App Build

I’m ready to commission a full-featured mobile application for my institute, Naukari Crown, aimed at students preparing for competitive exams. The app must launch simultaneously on both iOS and Android and support a mix of pre-recorded as well as live-streaming classes.

Core scope
The experience should guide learners from secure sign-up through paid or free course selection, daily study targets, and mock-test cycles, while giving me an admin back-office to upload content and track every user’s progress.

Key features required
• Student login & registration with OTP/email verification
• Free and paid course catalogue tied to a payment gateway
• Video classes: uploadable pre-recorded sessions plus real-time live streams with chat and attendance capture
• Daily targets, current-affairs feed, and push notifications
• Online tests, mock tests, instant scoring, detailed performance analytics, and downloadable PDF notes
• Admin panel (web) to manage courses, tests, users, payments, and notifications

What I need from you
1. A brief on the development approach (native, Flutter, React Native, etc.) that best meets an ASAP launch for both stores.
2. A clear timeline with milestones: design, MVP, beta, final release.
3. An itemised cost estimate covering build, testing, deployment, and one-month post-launch support.
4. Tech stack and third-party services you propose for video hosting, live streaming, analytics, and payments.

I’m looking to move quickly, so please share any similar work, your recommended roadmap, and how fast you can realistically deliver a polished, store-ready app.