A will is revocable at any time before death. It may also be revoked in the following situations: 

1.1 By Marriage (Section 13)
- Marriage automatically revokes a will unless the will was expressly made in contemplation of that marriage. 
- Divorce does not revoke a Will.

1.2 By Destruction (Section 15(d))
A Will can be revoked by being intentionally destroyed by the testator (or by someone else in the testator's presence and by their direction).

1.3 By a New Wll (Section 15(b))
A new Will may revoke an earlier will: 
Express Revocation: The new Will clearl states that all previous wills are revoked.
Implied Revocation: The terms of the new Will are incosistent with the earlier will, so they cannot stand together. 

1.4 By a Duly Executed Revocation Document (Section 15(c))
A will may be revoked by a document executed in the same manner as a will, expressly declaring an intention to revoke the existing will.