The duties of JMB are as below:

a) Maintain the common property and keep it in good serviceable repair;
b) Determine an impose charges for maintenance of common property;
c) Insure the building;
d) Comply with notices and orders by local authorities;
e) Prepare and maintain a register of all purchasers;
f) Ensure that the Building Maintenance fund is audited and provide financial statement to purchasers;
g) Enforce House Rules;

Tough and thanks less job, often get accuse of mis-appropriation and when vendor selected seems to be by your friend/relative ... even if they are good and fairly priced. 

get ready for politic/gangster/favouritism/