MyOn is a digital ebook subscription service, for which every student K1 through Grade 6 has an account.
For school name, type in "United World College" -- and choose the East campus.
Login using your UWC username (e.g., smith54321) and everyone's password is "east".
Here are some recommended sources for free audio books.
Internet Archive - Audio: Over 1 million items
Lit2Go: Collection of stories and poems in Mp3-audiobook format
Open Library: Search for a title and make sure to check the 'Only show eBooks' checkbox
Open Culture: 550 free audiobooks
Libravox: Listen to or read a book to add to the collection
The National Library Board (NLB) of Singapore has an amazing physical collection in 22 branches across the island, as well as online content, including databases, ebooks, and audio books.
The library is free for Singapore citizens and Permanent Residents. Foreigners can join for a one-time registration fee of $10.50, plus an annual fee of $42.80. Click here for more information about how to become a member. We highly recommend you join. (Unfortunately, the school is not able to join as an institutional member. They only allow individual accounts.)
Search audio books available via Overdrive here. In Advanced Search, choose "Audio books" as the format -- and then you can limit the search by reading level.