Training with Studies

With the Chess Olympiad only 2 months away, I'm ramping up my training regime. For the moment it is tactics and positional assessments, but I hope to do a bit of bike riding and fitness work as well.
In the area of positional assessment, I'm (re) working my way through Khmelnitsky's Chess Exam and Training Guide. Part of this work requires you to assess the position, as well as trying to find the best move(s). The study shown in the diagram is taken from the book (White to move btw). Before you try and solve it, what result do you expect. A win for white, a win for Black or a draw? And now, with White to move, what is the best continuation?