There are three independent challenges:
Instructions to complete each individual challenges are available in each of the sub directories.
Once you have completed all the challenges, run the build-deliverables.sh script to build the solution.zip archive.
If for some reason you cannot run this script, please make an archive that contains the content from all 3 directories (./javascript, ./python, ./sql) and name this archive solution.zip.
Then, send us your archive following the instructions we gave you by email.