Why Your IELTS Vocabulary Is Keeping You at Band 5.5 (A Real Case Study)

You’ve been studying English for years. You attended an English-medium school. You understand every word in the question. So why is your IELTS Speaking score still stuck at Band 5.5?

The answer almost certainly isn’t grammar. It isn’t fluency either. For the majority of mid-range candidates, the single biggest score killer is invisible to them: translation. You’re choosing words that make sense to you in your native language, but that sound unnatural — or even incorrect — to a trained examiner. And in IELTS Speaking, that pattern has a name: Lexical Resource, and it accounts for 25% of your entire score.

In this guide, I’m going to walk through a real candidate’s answer, diagnose exactly what’s dragging her score down, and show you the precise fixes that separate a Band 5.5 from a Band 7.

The Case Study: Mifta’s Band 5.5 Answer

Mifta is from Bangladesh. She’s been learning English since childhood and is genuinely hardworking. Her goal is to reach Band 7. She answered this Part 1 question:

“What is the most challenging part of learning English for you?”

Here is her response, word for word:

“For me, pronunciation was the most challenging part of learning English as I have learned English from my childhood and also I’m a student of English version school. That’s why I didn’t face any much trouble but while I’m pronouncing something I feel so difficult.”

On the surface, this sounds understandable. You can figure out what she means. But to an IELTS examiner, this response sends a clear signal: this candidate is translating from her native language. And that will keep her stuck at Band 5.5 no matter how many hours she studies.

Let’s break it down using the four official IELTS marking criteria.

Criterion 1: Fluency & Coherence — Not the Problem

Let’s start with the good news. Mifta’s fluency is actually her strongest area. She speaks slightly slowly, but that’s acceptable. Crucially, she keeps going — she doesn’t panic, freeze, or leave long, uncomfortable silences. She also uses basic linking words: as, also, and that’s why.

Her Fluency & Coherence sits at a solid Band 6. This is not what’s holding her back.

Criterion 2: Pronunciation — Two Specific Issues

There are two pronunciation problems an examiner will notice immediately.

Issue 1: Dropped sounds (enunciation). In the word challenging, I can hear Mifta dropping the middle syllable — it comes out closer to challnging. At Band 7 and above, complex words must be fully pronounced. Every syllable counts.

Issue 2: Word formation confusion. Mifta appears to say pronunciating instead of pronouncing. She’s blending the noun pronunciation and the verb pronounce into a word that doesn’t exist. This directly reduces clarity and will hurt her Pronunciation score.

The fix here is straightforward: finish your words. When you’re practicing, slow down on longer words and make sure every syllable lands.

Criterion 3: Grammar — Errors Present, But Not the Core Issue

Mifta says: “I didn’t face any much trouble.”

This doesn’t work grammatically. The correct forms are:

• I didn’t face much trouble. (remove “any”)
• I didn’t have any trouble. (replace “face much” with “have any”)

Mixing any and much like this is incorrect, but the meaning is still clear. Grammar errors are present, but they’re not Mifta’s core weakness. There is something more fundamental going wrong.

Criterion 4: Lexical Resource — This Is the Real Problem

Vocabulary, or Lexical Resource, is the main reason Mifta is stuck at Band 5.5. Her word choices consistently reveal that she is thinking in her native language and then translating, rather than thinking directly in English.

Here’s the evidence — three phrases that tell the story:

❌ Mistake 1: “English version school”

A native or high-band speaker would never say this. The correct, natural collocation is “English medium school.” The word version works in other contexts, but it doesn’t collocate with school in English. This is a direct translation from Bengali.

❌ Mistake 2: “I feel so difficult”

This is the most damaging phrase in her entire response, and here’s why:

In English, we use feel to describe emotions:

• I feel happy. I feel nervous. I feel overwhelmed.

We use find to express opinions about tasks or activities:

• I find it difficult. I find grammar confusing.

When Mifta says “I feel so difficult,” she isn’t just making a grammar error — she’s actually changing the meaning of her sentence. An examiner will notice this immediately.

The correct phrase is: “I find it difficult.”

❌ Mistake 3: “Face any much trouble”

Beyond the grammar issue, there’s a collocation failure here. In natural English:

• We face challenges (not trouble)
• We have trouble (not face it)

Mixing these two structures shows a lack of collocation precision, which is exactly what IELTS examiners are trained to identify at the Band 7 boundary.

The Band 9 Rewrite: Same Ideas, Upgraded Language

I answered the same question using the exact same ideas as Mifta. Nothing about the content changed — only the vocabulary:

“Honestly, pronunciation is the most challenging aspect for me. Even though I attended an English medium school growing up and didn’t have much trouble with grammar, I still find it difficult to get the sounds exactly right. I sometimes struggle to enunciate words clearly.”

Notice the specific upgrades:

• “English medium school” → correct collocation
• “I find it difficult” → correct verb choice
• “struggle to enunciate” → precise, high-level vocabulary

The ideas are identical to Mifta’s. The score potential is entirely different.

The Core Insight: Vocabulary Isn’t About Knowing More Words

This is the most important thing I want you to take away from Mifta’s case:

IELTS Speaking vocabulary is not about having the biggest word bank. It’s about using the right word in the right place.

Mifta knows English. She’s been learning it her whole life. Her problem isn’t ignorance — it’s precision. She needs to stop translating and start thinking in natural English collocations.

Your 3-Point Fix: From Band 5.5 to Band 7

If you see yourself in Mifta’s situation, here are the three targeted changes to make right now:

1. Stop translating phrases. When you catch yourself using a phrase from your native language, pause. Ask: “Would a native speaker actually say this?” Learn natural collocations — like English medium school — and replace your translated versions permanently.

2. Master find vs. feel. This one fix alone can improve your Lexical Resource score. Drill the phrase “I find it difficult / interesting / challenging” until it comes out automatically. Never say “I feel difficult” again.

3. Finish your words. Don’t drop sounds from long words like challenging or pronunciation. Slow down in practice, enunciate every syllable, and build the muscle memory for full, clear pronunciation.

Mifta’s problem isn’t a lack of ability or dedication. She just needs to redirect her effort toward precision over quantity — and once she does, that jump from Band 5.5 to Band 7 becomes very achievable.

Practice This Yourself

Mifta actually practiced using the SpeakPrac app — a tool I built specifically to help candidates like her practice privately, get instant AI feedback, and record their answers without the pressure of a live tutor. You can practice the exact same question Mifta answered, or submit your own recordings for expert feedback.

If you want to put this into practice, start with that one question: “What is the most challenging part of learning English for you?” Record your answer, listen back, and ask yourself: “Am I translating, or am I thinking in English?”

That single habit shift is what moves the needle.