Help me find the key to learn English?

Im a Vietnamese student. i like English very much.but when i do an English test though it easy or hard.i only do 90%-95%,not 100%.Please tell the key

I'm a Vietnamese student. i like English very much.but when i do an English test though it easy or hard.i only do 90%-95%,not 100%.Please tell the key to do it 100%.Thank you very much.

or:I'm a Vietnamese student. i like English very much.but when i do an English test though it easy or hard.i only do 90%-95%,not 100%.Please tell the key to do it 100%.Thank you very much.

or:It is very hard to make up any example that 100% of native speakers will agree on. A score of 95% is better than most native speakers would do.

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