Define "easier." Is 曜 easier than 舌? Is 雑 easier than 廿? Is 誌 easier than 屯? If you mean "easier because you see them all the time and as a result your memory is reinforced much more frequently and without the necessity of artificial means," I agree. If you're using another definition, I'm interested in knowing what it is (I know there are others, which is why I'm asking).
Incidentally, I like the Heisig method outlined in Remembering the Kanji I. I used it, and it boosted my comprehension of kanji from ~400 to over 1600 in a much shorter time than it took me to get to the ~400. The remaining 400 or so took a while because I found myself lacking in imagination after a while, but I'm definitely a fan of the method.
There are lists of JLPT Level 4 kanji online, as well as grade-by-grade level for elementary school students in Japan. Those might be good to start with.