Most places aren't offering driving tests to people if you're not a key worker, in the coronavirus pandemic. It's best to just keep an eye out on the website for tests and see if anything opens up sooner than your current date. A lot of people cancel their tests tbh.
I will say though, the earlier in the day you have your test the better it will be for you. I had my test at 2pm and I spent the whole day worrying about it, I was a bag of nerves. Luckily I passed however I know that if I had gone with an earlier time, I would have been more confident and may have gotten less minor faults. Just make sure you eat before your test and get some energy, I had a banana right before taking my test.