Definitely! 100% a good result. It is actually an amazing result. I would be very proud of myself if I got results like this again (I got 90% on my second year summer exam) because since then, my results have dropped.
Thats really good, you still need to work hard in 3rd year though, I got low B for my 2nd year christmas exam and now I'm aiming for an A. It really depends on the work you do in 3rd year - so keep it up!