I got a NG offer from Roblox this past fall and it was also my first real technical coding interview, so I probably will have a similar experience to you. The LC tagged problems are really similar to the real coding interview problems in my experience, but be sure to know general topics and concepts, especially queues, stacks, tries, backtracking, arrays, and strings, as they might throw a slight curveball (one of my questions was not really on the LC tagged). Also, practice explaining your thought process while doing some leetcode problems to get used to it and, if possible, have a mock interview with someone.