Driving Test in two weeks

I had a test at the beginning of June that I failed with one serious. I asked my brother to look for cancellations for me while I was at work. Now completely my fault I didn’t mention that I didn’t want a test in July because I haven’t driven since my test and its very short notice. He found and booked a cancellation for 11th July which is in TWO WEEKS. I genuinely didn’t think a test in two weeks was an option. Monday is the last day to cancel. Do you think I should cancel based on the fact I haven’t driven in close to a month and the last time I did was a failed test? Any advice is much appreciated