Race to Your Goal! December 2020 JLPT

I tend to go from 0 lessons to 150 or whatever number of lessons when I level up. Do you study all 150 together??

Also always keep in mind how the system works: only kanji matter for leveling up (and indirectly radicals as well, since you can’t unlock the kanji without them). What I’m saying is get rid of all the radicals as soon as you level up, and of all the kanji as soon as the second kanji wave comes (the one previously locked due to the radicals).
You can use a reorder script (like this: WaniKani Lesson Ordering II) (WaniKani Lesson Ordering II (obsolete, does not work))

Sorry if you already knew about it