Lexical Resource assesses whether you have the words to handle unfamiliar topics, whether you choose the right one, and whether you can work around the gap when you do not have it. Three things, and none of them is "did you use long words".
Recycling is the biggest silent cost
Every answer has a handful of words the topic pulls towards. Talk about work and "job", "work" and "important" show up repeatedly without you noticing.
Repetition is measured, and it is the most common reason a candidate with genuinely decent vocabulary scores below what they expect. The words are there; they just are not being reached for under time pressure.
The diagnostic is easy: record an answer, then count your own most frequent content word. If one word appears five or six times in two minutes, that is your ceiling showing.
The fix is narrow and works. Take the word you leaned on, find two alternatives that genuinely fit, and use those in your next answer on the same topic. Two, not ten - the constraint is what makes it stick.
Precision beats difficulty, every time
A common word used exactly outscores a rare word used approximately. A misused rare word is worse than no rare word at all, because it tells the examiner the item was memorised rather than acquired.
Consider "ubiquitous". Candidates learn it, then apply it to things that are merely common. The word means present everywhere at once, and using it for "popular" is a visible seam.
The rule that survives contact with an exam: never deploy a word you have not heard someone else use in a sentence. Recognising a definition is not the same as knowing the word.
Collocation is where the marks actually are
Collocations are the word partnerships English happens to use. Heavy traffic, not strong traffic. Make a decision, not do a decision. Deeply concerned, not strongly concerned.
None of it is logical and all of it is noticeable. Wrong collocations are the clearest signal of a non-native speaker, more so than accent, and getting them right does more for a Lexical Resource score than any number of rare words.
They are also learnable in a way single words are not, because they come in fixed chunks. Learn "make a decision" as one unit and you never have to choose the verb again.
Practical approach: whenever you meet a new noun, learn the verb that goes with it and the adjective that commonly modifies it. Three items instead of one, and the extra two are where the marks sit.
Paraphrase is explicitly rewarded
The descriptors mention working around unknown vocabulary. This is worth reading twice, because it means not knowing a word is not the failure. Stalling because you do not know it is.
The skill is having a route ready. Forgotten "reservoir"? "A big artificial lake where a city keeps its water" costs you nothing and demonstrates exactly the resourcefulness being assessed.
Candidates who freeze at a lexical gap are usually treating the exam as a vocabulary test. It is a communication test, and communicating around the gap is a pass, not a workaround.
The idiom trap
Idiomatic language appears in the upper band descriptors, so candidates memorise a handful and force them in. "It was a blessing in disguise" arrives in an answer about public transport and the examiner hears the seam immediately.
Two rules keep this safe. Use an idiom only if it fits so naturally you would have used it without preparing. And one per answer at most - a second is what turns a natural phrase into an obvious strategy.
Phrasal verbs are the safer version of the same instinct. "Put up with", "come across", "get by" are idiomatic, entirely natural, and rarely sound rehearsed.
Learning from your own errors rather than a list
Generic word lists have a poor transfer rate because they are not connected to anything you said. A phrase you got wrong in your own answer, about your own life, brought back a few days later, sticks in a way item 47 of a band 8 list does not.
That is the argument for a correction loop built from your own recordings - the material is already personal, already in context, and already demonstrated to be a gap rather than assumed to be one.
A four-week routine
- Week 1: record answers on four topics. Do not study. Find your recycled word on each.
- Week 2: two alternatives per topic, used deliberately. Check the diversity measure at the end of the week, not daily.
- Week 3: collocations only. For the ten nouns you use most, learn the verb and the adjective that go with each.
- Week 4: paraphrase drills. Answer questions while deliberately avoiding your usual word for the topic.
Nothing in that plan involves memorising an impressive word, and it will move the score further than a month of doing so.