I do not see anyone as a Trainee like BMT can focus on part time studies however I do see servicemen succeeded in retaking O level while in 1st year of NS once they are posted to an unit with a vocation.
Go ahead and retake O levels. however, after you are posted to a "laid back" unit, hopefully you have time to study in some evenings and weekends.
You may get tuition for some of your weaker subjects.
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