Isit advisable to let your agent invest whole lump sum into China market funds?

Putting all the investments into a single market is too risky. Diversifying the investments into different markets, US, China, etc, is a safer option.

Definitely not the wisest choice.

There's limited investable products for CPF monies in the first place but if you are using the funds for the house you might be better off paying more in down payment? unless what you mean is you prefer keeping the CPF money in CPF so you are going to shift out the funds befor you get the house so that it can't be deducted? If so that increase your mortgage and are you ok with that? Whichever agent is this seems to be very aggressive? Whilst the Chinese market is currently in the slumps you should be diversifying rather gambling on China's recovery in 7 years. It is of course possible but are you the kind that is able to withstand you hard earned funds being in the red and not be paper fingers and sell? if this is your agent's only recommendation then you might wish to consider seeking other agents for financial advice.

It is important to have agents that are aligned with your interest, it is obvious that your agent dont have your interest in mind or just not qualified.