I expect @Pacifico will be here very soon to offer you his guide. I like to kid him that it's practically his calling card, but it's actually very good advice.
Just keep reminding yourself to pay careful attention when reading the scenario and rules. Maybe write a reminder to pay attention on a note card or sheet of paper and post it above your desk.
I would find a backup watch like the 35minutes one or something similar and then if you never get the 180 watch before the test just file a claim with your credit card company to refund your money since you never received the product.
@hjlee1992 said:
I purchased the watch about a year ago.
Do you still have the little instruction card that came with it? It does include guidance on how to correct this particular issue, if I recall correctly.