Either they trying to confuse the opposition candidates or they
holding early election because they forsee lots of opposition
votes. Hold early still got 1-2 years before handing over the
reins? Then they can set up alot of booby traps in the
gov, "to fix the opposition", then when
opposition screws up, they can come out and say, "See! we told you
so, we are the only party capable of running this country".

Unfortunately, election can only be done after the Parliament is
dissolved.
When an election is held 1 to 2 years before the Parliamentary
term is over, the Political Party in power is actually dissolving
itself and offering itself for election.
If it loses, it will have to handover the seat of government
immediately, and not when the 5 year term is over - as it was
voluntarily abrogated by dissolution of Parliament.
The "booby traps" have all been laid over the last 50 odd years
since the PAP begin to turn the Government into Singapore Inc. with
a huge stable of government linked companies that provide all the
different essential and non-essential services to
Singaporeans - ranging from the printing of currencies,
generating and distribution of electricity
and water, collection and disposal of sewage and garbage,
food supply and distribution chain, buildings and construction,
air-land-sea transport services, armament design and
production, banking, finance and investments, research and
development, manufacturing, and broadcast and publishing.
The fixes are already made when loyal senior party members
and civil servants are transferred to head all these multifarous
enterprises that the government rake in to bloat a humongous
revenue surplus that no other government can boast of.
As matters stand, the PAP dominated Parliament has passed
legislation that does not allow any change to the "appointments" of
the Chief Justice, Police Chief and the SAF Chief by any new
Government unless with an "overwhelming" consent from
Parliament.
How will any Alternative Political Party forming a new
Government control the various functions of government and the
various government-linked companies that are headed by PAP
cronies and appointees ?