If I become fluent in English I'll be able to get good scores in [or "on", depending on the English dialect] exams.
In American English I would use the "on exams" so other native speakers would have to let you know whether they tend to use in or on talking about exams.
2021年2月7日
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If I become fluent in English, I’ll be able to do well in exams.
2021年2月7日
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If I become fluent in English Ill be able have good score in exams
If l become fluent I'll be able to have good score in English exam
2021年2月10日
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If I become fluent in English Ill be able have good score in exams.
2021年2月9日
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If I become fluent in English, I'll be able to get good scores in exams.