Yes, the provisions regarding the residuary estate in a Will can be changed or revoked by the testator (the person who made the Will) during their lifetime. A testator has the right to modify or update their Will as their circumstances or wishes change.
To change or revoke the provisions related to the residuary estate, the testator can execute a new Will that explicitly reflects their updated intentions. It is important to follow the legal requirements for executing a valid Will in Malaysia, including the need for witnesses and signatures.