Most CSS aspirants have studied grammar for ten years or more. They have memorized the definition of a noun, the eight parts of speech and long lists of rules. Yet when they sit down to write an essay or correct a sentence in the exam, much of that knowledge seems to vanish. The problem is not effort. The problem is how grammar was taught to them in the first place.
Grammar was taught as definitions, not as work. A noun is the name of a person, place or thing. A verb shows action. These sentences are easy to memorize and almost useless in practice, because they describe what a word looks like rather than what it does. The same word can be a noun in one sentence and a verb in the next. A student who only knows definitions cannot tell the difference.
Rules were taught in bits. One day it is articles, the next day prepositions, then tenses. Each topic arrives with its own list of examples, and each is tested separately. In the exam, however, no sentence comes labelled with the rule it needs. The student has to look at a whole sentence and decide what is wrong, and isolated rules give no way to do that.
Learning was passive. Students read the rule, read the example and nod. They rarely build sentences of their own, take them apart or test the rule against fresh material. It feels like learning, but it is closer to recognizing a face in a photograph than being able to draw it.
Mistakes were treated as rule violations. When a sentence is wrong, the usual advice is to find the rule that was broken. Many errors, however, are not about a single rule at all. They come from a sentence that was never built properly: a missing core piece, a clause attached the wrong way, a modifier left hanging. Length makes this harder to see, because a long sentence can look complete and still be broken.
Grammar was separated from reading. Students rarely connect the rules to what writers actually do on the page. A good grammar habit is much like learning to drive. You do not recite the rules at every turn. You absorb the patterns through repetition until they become automatic, and the best source of those patterns is steady, attentive reading.
So what changes? Start with the whole sentence rather than the rule. Ask what each word is doing, not what it is called. Take long sentences down to their essential parts, and practise adding detail back to short ones. Do this on real material from newspapers and past papers, a little each day.
Grammar was never meant to be a list to memorize. It is the structure that lets a sentence carry meaning, and once you can see that structure, both reading and writing become noticeably easier.