start again
If you don't finish in time, you have to start over from the beginning.
Can I make these few corrections or do I have to start over?

SMART Vocabulary: related words and phrases

Starting again
back to square oneidiom
continue
get back to someone
go back to someone
go on
re-entrant
reboot
reborn
recommence
recommencement
recreation
reinitiate
reoccupy
reoccur
reoccurrence
reopen
reset
slate
start
with the slate wiped cleanidiom

start (something) over | American Dictionary

start (something) over

phrasal verb with startverbus/stɑrt/
to begin something again:
I decided to throw out what I'd written and start over.
We had to start the whole thing over when we realized our mistake.

start over | Business English

start over

phrasal verb with startverbuk /stɑːt/us
US(UKstart afresh)
[ I ]
to begin to do something again, sometimes in a different way:
We decided to abandon the first draft of the report and start over.