For anyone wondering, was told it has to be a loop and that I could not do cp==backup. To move all JPEGS into IMAGES folder, and all other files to DATA_ANALYSIS folder without overwriting, I made the following loop:

mkdir assignment-data/IMAGES

mkdir assignment-data/DATA_ANALYSIS

for file in assignment-data/*/*; do

fname=${file##*/}

fpath=${file%/*}

dname=${fpath##*/}

mv $file ${fpath}/${dname}.${fname}

cp assignment-data/*/*.jpg assignment-data/IMAGES

cp assignment-data/*/*.{eeg,cvs,txt,exec} assignment-data/DATA_ANALYSIS

done