Talking to us helps heaps.
Being able to squawk helps heaps more.
Trying to get IM traffic down through a low cloudbase to recover is not the easiest thing when the weather below is lovely for the non-squawking community, and as flobadob pointed out we may not even see you if we are SSR only as happens from time to time.
Flying around with no transponder and not talking to anyone can be dangerous from where I am sat BUT it is perfectly legal in the right piece of airspace and to be honest that's the way people like it on the whole, or we'd have gone down the route of many other countries.
If you can't chat or squawk just be aware of the airspace around you and what weather descending aircraft are likely to be experiencing.
Maybe try and get a visit to a local radar unit and see actually how wide their pattern is. I know it surprises the visitors we get.
Oh, and when you do get on the air be very aware that noise of the air can distort your radio alot, so keep the message succinct.
Good luck with the radio exam.