... if you think that I can jump the gap to les adieux then that's great. 
It's hard to tell without hearing and seeing your playing. But your teacher sees/hears you play, so I would go on his recommendation.
The challenges of les adieux are primarily musical, not technical, imo.
in any event, it's not a question of success or failure, you'll surely get something out of it, these are your first passes at these piano sonatas, you will likely visit them again in later life.