How do I code??

I got selected for afterschool programming classes and they've done about 37chs Java and 19 HTML + CSS. I was stressing at first but after going through them ik at least 90% of the theory thru Olevel pseudocode but now idk how to learn the proper syntax for java (HTML is shi easy and CSS syntax ain't that bad). I haven't really learnt python yet (I picked up compsci like 4 months ago) but I can understand it because of how simple it is and will learn it seriously in ~June as soon as CAIEs over but rn I need to learn Java syntax or I'll fall behind in class to te point ion even know theory anymore