Live online English classes · B2 to C2
Personalised live classes with a Cambridge-certified teacher. Built around your goals, your pace, and your life — not a textbook.
Watch: the one shift that helps intermediate learners finally move forward
About Ketlyn
I'm Ketlyn Fernanda Leva — an English teacher with a BA in English, Cambridge certifications, and graduate studies in Applied Linguistics. Since 2016, I've helped adult learners break through the intermediate plateau and communicate with real confidence — in business, academia, and everyday life.
Read more about me →
Our mission
"To help you refine your English and achieve your goals — through personalised lessons, real-life practice, and a methodology grounded in Applied Linguistics."
Productive skills first
Speaking and writing from day one. You identify your gaps by producing language — not by studying rules.
Personalised to you
Every plan starts with a free assessment of your level, goals, and schedule. No cookie-cutter courses.
Real-time feedback
Synchronous classes only — I'm with you throughout, correcting pronunciation and nuance as you speak.
What we offer
One-on-one
A fully personalised experience built around your goals, pace, and schedule. Every lesson is tailored to you — from grammar to pronunciation to exam prep.
Professional
Communicate confidently in meetings, emails, and presentations. A direct investment in your career — helping you negotiate, network, and lead in international environments.
Exam prep
Open doors to international jobs, academic programs, and visa requirements. Targeted preparation for Cambridge exams — with a teacher who holds the C2 Proficiency herself.
Collaborative
Practice real conversations with peers who share the same goal: advanced English. Dynamic, engaging, and cost-effective — ideal for learners who thrive in a collaborative environment.
Not sure which one is right for you? Ask me on WhatsApp →
Student stories
Real results from real learners — in their own words.
Ketlyn's methodology feels truly friendly and adaptable, yet still highly effective. I feel truly comfortable speaking English and have passed all my Cambridge exams with high scores. I couldn't ask for a better teacher.
Matheus Orasmo
Since I started my classes with Ketlyn, I have felt more comfortable and confident giving business presentations. I have also noticed significant progress in my English-speaking skills. A great teacher!
Ana Elisa Caravetti
Having a teacher who not only teaches but also understands your difficulties and is always there to help makes the learning process enjoyable and much easier. I used to start and stop studying English repeatedly — but now I feel motivated to keep going and make progress!
Sérgio Luis Traldi
After years of switching schools without making real progress, I finally feel confident that I'll succeed. Ketlyn is more than a teacher — she's a supportive guide who never lets you doubt your potential. Thank you, Ketlyn, for being my compass on this journey.
Rosangela Góes
The B2 and Beyond
Fluency strategies, mindset shifts, and practical advice — from a teacher who's lived the journey herself.
Deep Work vs. Shallow Work: Why You're Stuck at Intermediate (and How to Move Up)
If you feel stuck even though you've been studying, the problem might not be effort — it might be the kind of effort.
Read more → Fluency Mindset"I've Finished My English Course… So Why Don't I Feel Fluent?"
Completing an advanced course and still feeling far from fluent is more common than you think. Here's why — and what to do next.
Read more → SpeakingWhat NOT to Do to Improve Your Speaking Skills — 6 Key Tips
Avoiding these six mistakes is just as important as practicing. Discover what holds B2+ learners back and how to break through faster.
Read more →KFL Idiomas helps adult learners reach advanced English with clarity and confidence. We offer personalised live online classes — private classes, Business English, exam preparation, and group classes — designed for learners at intermediate and advanced levels (B2 to C2).
The Productive Skills First approach prioritises active speaking and writing over passive listening and reading. By producing language from day one, students identify their own linguistic gaps in real time. Grounded in Applied Linguistics theory, this method ensures faster mastery and more confident communication than traditional grammar-heavy models.
We move learners beyond their comfort zone into active language production. Our method focuses on mindset shifts and S.M.A.R.T. goals rather than more grammar study. By working within your Zone of Proximal Development (ZPD), we target the nuances required to transition from B2 to authentic C2 fluency.
KFL Idiomas was founded by Ketlyn Fernanda Leva, who holds a BA in English (PUC-Campinas), Cambridge ICELT, DELTA Module 1 (Level 7 equivalent), and the C2 Proficiency certificate. She has also studied Applied Linguistics at Unicamp and has been teaching since 1997.
All KFL Idiomas classes are 100% live and synchronous. You get real-time feedback, immediate correction of pronunciation, and a human-centred learning environment — something AI apps and pre-recorded courses simply cannot replicate.
The minimum study commitment is 6 months. This ensures enough consistent practice to see measurable progress in your fluency. You can choose to study once, twice, or three times a week depending on your goals and schedule.
Still have questions? Send me a message on WhatsApp →
