Hi Paul and welcome.
I have to say that I would agree with the above comments, not in regard to the R6 (I have never ridden one so can make no comment about the bike itself) but about riding generally.
Obviously you know about yourself and whether or not you will restrain your right hand, but for me passing your test is only the first stage. Frankly I would suggest that a Thundercat is more than big/powerful enough for a novice rider, and maybe you should consider something even 'tamer' such as a GS or CB500, a Diversion 600 or similar. Such a bike will give you invaluable experience, whilst not costing too much to buy or insure and should the worst happen the repair bills would hopefully not be too bad either. Even a simple low speed drop on a bike with lots of plastic can be ruinous! After a year to eighten months you would probably find the transition to a bigger bike a lot more comfortable.
Just my thoughts, and good luck with the test.
Andy