My wife will be going to renounce her Malaysian Citizenship in Singapore at Jervois Road. You will need to be at the embassy before 8AM and get a queue number. They only process a limited number of applications per day.

All documents (except Form K) must be accompanied with 2 photocopies. Ensure you bring all the necessary documents and photocopies for the application procedure.

Here’s what you need to bring with you:

1. Passport
2. I/C (Singapore & Malaysian)
3. Birth Cert (laminated)
4. Singapore Certificate of Citizenship
5. Expired (or not expired) Malaysian passports
6. Original Form K, which is Yellow.
7. 3 recent passport-sized photos (blue or white background)
8. SGD$6

Documents Needed for RENUNCIATION OF MALAYSIAN CITIZENSHIP>>>

There are some Malaysians who cannot have the patience to wait up to 5 months for the whole procedure to complete. They cross the Causeway to speed up the process.
Read this blog to find out more>>>

Singapore Citizenship Approval Letter
The approval letter is valid for eight months. But the RENUNCIATION OF MALAYSIAN CITIZENSHIP is going to take at least 5 to 8 months. The approval letter can be extended if you need more than 8 months by booking the Oath Date

You need to book the Oath Date through their e-site and the approval letter valid will auto-extended. The web site to make the oath booking is under Citizen Registration.
https://eappointment.ica.gov.sg/ibook/index.do
** you only  able to change 3 times and no more.