How Long Does It Take to Improve Your DET Score?

Every week someone asks us the same question: "I need 20 more points. How long will that take?" The honest answer depends entirely on where those 20 points need to come from — and most students are looking in the wrong place.

The answer had nothing to do with how much she studied. It had everything to do with what she was practicing — and what the DET is actually measuring.

What the DET is actually testing

The DET doesn't test whether you know English. It tests whether you can use English fast, under pressure, without stopping to think.

There's a difference between knowing a word and being able to use it in a sentence before the timer runs out. Think of it like driving: at first, you think about every move. After years of practice, you just drive. The DET is testing whether your English is at the "just drive" stage — not whether you studied the manual.

Most DET students are stuck in between. Their knowledge is solid. Their ability to produce it instantly, without hesitation, isn't. The DET is adaptive and fast — it doesn't wait, and it penalizes hesitation. That's why studying harder often doesn't move the score.

How long improvement actually takes

Language research is consistent on this: moving from knowing something to producing it without thinking takes time and the right kind of practice. There are no shortcuts — but there are faster and slower paths, and most students are on the slower one without realizing it.

Here's what realistic timelines look like, based on that research and the students we work with:

These timelines assume 30–60 minutes of focused daily practice — not passive review, but active output: speaking out loud, writing without editing, responding to prompts under time pressure.

Your subscores tell you more than your overall score

The DET gives you four subscores: Literacy, Comprehension, Conversation, and Production. Your overall score is an average of these four — which means a single low subscore can hold your entire average down, even if the other three are strong.

This is the most common pattern we see at the 100–120 range: one subscore sitting 15–20 points below the others, quietly capping everything. Students keep doing general practice across all areas when one targeted fix would move the needle much faster.

The 115–130 range is the hardest — here's why

Students scoring 115 already have strong English. Their grammar is solid. Their vocabulary is broad. The DET isn't punishing what they know — it's exposing a gap between knowledge and speed.

One student came to us scoring 125, needing 130 for his program. He'd taken the test four times. His Conversation subscore was 10 points below everything else — he was editing in his head before speaking, which slowed his responses enough to affect the score. Six weeks of targeted speaking output work moved him to 132.

What doesn't work

Retaking the test without changing your practice. Your score reflects your current ability to produce English under pressure. Taking the same test again without changing how you practice gives you the same result — sometimes 5 points higher or lower due to test variation, but not a real improvement.

Passive review. Re-reading vocabulary lists, watching videos, reviewing grammar rules — all of this builds knowledge. The DET tests output. These are different skills, and passive input doesn't develop output speed. For a breakdown of the specific thinking mistakes behind this, see Why Your DET Score Won't Move.

Starting two weeks before your exam. Two weeks is enough to get familiar with the test format, which might add 5 points. It isn't enough to change how fast your brain produces English. If you're serious about a 15+ point gain, give yourself 6–10 weeks minimum.

The one question that predicts your timeline

When you speak English, are you translating from your first language — even just occasionally — or are you thinking directly in English?

If you're still translating, your Conversation and Production subscores are paying for it. Closing that gap is what drives scores from 100 to 120+. If you're already thinking in English and still stuck, the gap is almost always one subscore pulling your average down — a much more targeted problem to solve.