One thing I'd say about booking your test is give yourself lots of time.
See, although I'd had lessons before, I don't think I was ready for some of my test's looking back, because my driving hadn't been consistent.
I know people say that when you drive, it's a skill you don't normally forget and although I had learnt to drive, it wasn't enough to get me through a test. I think the lesson's need to be consistent. I had too many gaps in between lessons so misjudged how ready I was for my test.
You've had 13 hours so far, I would give yourself another 13 or so with consistent and regular lesson's, because you do need to keep doing the lesson's for your driving skills to improve vastly. Mine never got past the basics and both me and my instructor held our hands up to that with realising we had both misjudged how ready I was.
Having said that, that was my situation, you might be completely ready but from personal experience, I would give yourself more time, because as ready as I thought I was, I wasn't really. It's only now after almost a year of regular lesson's and being on my 5th attempt that I really do feel confident that I can pass.
Like I say though, that's just me, you might find that you are completely ready and will sail through it and if you do put it for your test, I hope you do because as I'm sure the other ladies will back up, passing is a wonderful feeling and I can't wait to feel that myself.

xxx
Sorry for the ramble lol! xxx