I think, if you aren't worried about the £80, then you should consider taking it. It coudl be suggested if your training school have contacted you, rather than the other way around about the test, maybe they think you are ready. However, my concern, in honesty, is that once having a full license, you will just decide to have no further training. However looking at your posts, you seem to think you need more training, and based on your posts alone, as i have never seen you riding, I think you would benefit from more training too. Motorbikes are fun, but they are also death traps if not used properly. I passed my test fully confident that i could control a bike, having sat the correct training, I have had a couple of near misses, but i think due to my training, its how they stayed as a near miss, and not a crash. I personally would not like to ride with a full license, knowing im not trained fully. Also have you sat your theory test yet? Have you read up on the show me tell me questions, and the pillion questions? Are you comfortable with emergency stops, U turns, and such like? If all of the above you are, then go for it. But IMO, definately seek further training after your test.