The particular song that you chose almost demands that you overload the video with internal and beat sync for most of the AMV. The beginning of the video kinda lacked both. In other words, you had a whole bunch of scene changes that seemed random and didn't happen on any particular beat. And towards the middle of the video, the song started to slow down, and I think that you started to use a little too much beat and internal sync. But towards the end, I think that you started to find a nice balance. The timings were a bit off, but for your first AMV, you did well

Congrats on finishing your first AMV

and welcome to the org.
Spoiler :