攞好高分、成續好好，英文可以講成 pass with flying colours / nail (it)
e.g. I passed Physics with flying colours.
e.g. I nail it!
想講啱啱好合格咋，英文可以用barely pass 或者a real squeaker 或者 a close call
e.g. I barely passed my exam.
e.g. My driving test was a real squeaker.
A: How’s your score?
B: I’d say it’s a close call.
差幾分先夠合格，英文係fall short of a few marks from passing
e.g. I ended up falling short of a few marks from passing.
比預期中好／差，英文可以用 higher / lower than I expected.
e.g. My maths score is much higher than I expected.
I screwed / messed it up.
差到核爆，英文可以講成 a failure / a bust
I am pretty sure my English test would be a bust.
The exam result was a failure.
至於緊張，除左用nervous, 都可以用下 tense up / uneasy / edgy 等等。