You cannot avoid Faraid in Singapore, since Muslims and non-Muslims are subjected to different sets of inheritance law.
However, you are allowed to will away a maximum of 1/3 of your entire estate to non-Faraid beneficiaries (eg. illegitimate children, family members who are not Muslims, etc.). The rest will be distributed under the Faraid.
Here is a list of some Muis-suggested alternative estate planning tools that you can use, which do not have to fall under the Faraid:
Hibah - Gift given out while you’re alive.
CPF and insurance nomination - Treated as gifts. Your CPF and insurance will be distributed based on your nomination after you pass away. Without nomination, they will go to your estate and be distributed based on Faraid.
Joint Tenancy - For properties held under joint tenancy, the right of survivorship applies and the surviving owner gets 100% of the property when a co-owner passes away.
Deed of Family Arrangement - A legal document that can allow beneficiaries of an estate to alter the distribution made under the will or intestacy laws.