Thanks for your responses.
The reason why I am asking this is that I have already taken theory classes for PPL and have paid for it in Austria, but for now I have decided to go for Ultralight due to the financial reason...I don't wanted my time and money to go to waste and hence still wanted to go ahead and answer the PPL exams though I now opted for Ultralight. So, I was just checking if I can save on re-answering the exams later in the future if I ever decide to go for Airplane PPL.