HS student with prior programming experience looking to pick up Java syntax quickly

Hello there, I am currently a HS student with a fair amount of programming experience. I would say I am fairly versed in general CS principles, with good knowledge of various data structs and algorithms, OOP, DP, etc. The two languages I currently primarily program in are Python and C#, both of which I feel fairly comfortable with. Now, recently, I signed up for the AP CS test, which uses Java. Looking at past problems, I feel confident I could solve all of them fairly easily with Python, however, I don't really know any Java. I do know that C# and Java are relatively similar languages, which is why I feel good about being able to pick it up fast--again, on the general CS/problem solving side of things I feel very prepared, I just need to pick up syntax and get a decent understanding of the language. Currently, I am simply re-writing some old projects of mine combined with the usual googling, reading documentation and SO surfing. Would anyone have any good resources beyond this that might be of help? Thanks!