Date of the last update: 06.05.2026
Cambridge English exams are among the most respected language tests in the world. However, their purpose is not to assess knowledge of isolated grammar rules, but to evaluate communicative competence – in other words, how effectively you can use English in real-life situations.
Based on the experience of our teachers and examiners, many candidates lose points not due to a lack of knowledge, but because of small, recurring mistakes. Importantly, most of these can be avoided with conscious preparation.
Below, we outline the most common exam mistakes along with examples and practical tips on how to avoid them.
Table of contents:
- Grammar: Small Mistakes That Cost You Points
- Thinking in Your Native Language, Writing in English
- Reading & Use of English: Read Carefully
- Writing: Precision Matters
- Vocabulary: Quality Over Quantity
- Listening and Reading: Focus on Meaning, Not Individual Words
- Speaking: A Conversation, Not a Monologue
- Exam Day: Preparation Is Key
- Summary
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Grammar: Small Mistakes That Cost You Points
At B2–C2 levels, candidates usually know grammar rules. The difficulty arises when they need to apply them automatically under time pressure. It is these small slips – not complex structures – that most often lower the final score.
Most common grammar mistakes:
Mixing Present Perfect and Past Simple
Using Present Perfect with a specific time in the past leads to loss of points.
NO: I have seen this movie last week.
YES: I saw this movie last week.
NO: They have moved here in 2020.
YES: They moved here in 2020.
Incorrect use of continuous forms
These often appear with stative verbs or when describing general truths.
NO: I am understanding the problem now.
YES: I understand the problem now.
NO: People are needing more sleep nowadays.
YES: People need more sleep nowadays.
Missing the -s ending in the third person singular
This is a very common mistake, even at higher levels.
NO: She drive to work every day.
YES: She drives to work every day.
NO: My brother play football on weekends.
YES: My brother plays football on weekends.
Incorrect use of articles (a / the)
Problems arise both from omitting and overusing them.
NO: I bought interesting book.
YES: I bought an interesting book.
NO: Moon looks beautiful tonight.
YES: The moon looks beautiful tonight.
NO: He is the engineer. (when speaking generally about a profession)
YES: He is an engineer.
Incorrect prepositions
Many expressions need to be learned as fixed combinations.
NO: She is interested on art.
YES: She is interested in art.
NO: He suffers on stress at work.
YES: He suffers from stress at work.
NO: We discussed about it yesterday.
YES: We discussed it yesterday.
Thinking in Your Native Language, Writing in English
Literal translation from your native language often leads to unnatural or incorrect expressions in English. Instead of translating word-for-word, it is better to think in English and use natural structures.
For example, Polish native speakers often make mistakes influenced by their first language, such as using “have” instead of “be” for age, or translating verbs directly (e.g. “do a photo” instead of “take a photo”).
This part of the exam tests precise understanding and conscious language use. Focus and careful analysis of instructions are key.
Most common mistakes:
- Ignoring the word limit
In Sentence Transformation tasks, exceeding the word limit results in zero points. - Incomplete transformations (Word Formation)
Candidates recognize the base word but miss prefixes, suffixes, or plural forms. - Spelling mistakes
Even a minor typo can make the answer incorrect.
Writing: Precision Matters
In the Writing section, the following are assessed:
- Content
- Communicative Achievement
- Organisation
- Language
Most issues result from not reading the task carefully.
Typical mistakes:
- Incomplete task fulfillment
Omitting one required point leads to loss of marks. - Inappropriate register
Using informal language in a formal text. - Lack of structure
A text without clear paragraphs, introduction, and conclusion is difficult to follow.
Vocabulary: Quality Over Quantity
A wide range of vocabulary is an advantage, but it must be used naturally.
Typical mistakes:
- Repeating the same expressions,
- Limited range of synonyms,
- Overly long sentences that lose clarity.
Example:
NO: very big, very nice, very fast
YES: large, pleasant, rapid
Listening and Reading: Focus on Meaning, Not Individual Words
Cambridge exams often include so-called distractors – elements designed to check whether you understand the overall meaning, not just individual words.
Typical situations:
- A word from answer A appears, but the context indicates answer B,
- The speaker changes their opinion during the recording.
That is why it is important to listen carefully until the end before choosing an answer.
The speaking test is conducted in pairs or groups of three. Interaction is also assessed.
Most common mistakes:
- Dominating the conversation,
- Giving very short answers,
- Long pauses while searching for words.
Instead of silence, use natural fillers:
- That’s a good question…
- Let me think for a second…
Exam Day: Preparation Is Key
Your result depends not only on language skills, but also on your organisation.
Remember to:
- Carefully read all messages from the exam centre,
- Check the schedule and timing of each part,
- Arrive early to reduce stress,
- Ask the exam staff if you have any doubts,
- Make sure you transfer your answers to the answer sheet,
- Manage your time and leave a moment to check your answers.
If you have any questions about exam organisation, it is best to contact the centre directly – a short call or email can save you a lot of stress.
Summary
Many mistakes made in Cambridge exams result not from a lack of knowledge, but from time pressure, stress, and unfamiliarity with the exam format. That is why, in addition to learning grammar and vocabulary, it is worth regularly practising with exam papers and analysing common language traps.
Being aware of your own mistakes and working on them systematically allows you to make the most of your skills and achieve a result that reflects your true level.
