To solve - find an answer to, explanation for, or means of effectively dealing with (a problem or mystery).
A Task - a piece of work to be done or undertaken.
Sort out - resolve a problem or difficulty.
A Review - a formal assessment of something with the intention of instituting change if necessary.
A Schedule - a plan for carrying out a process or procedure, giving lists of intended events and times.
Seldom - not often; rarely.
To keep track of - remain fully aware of or informed about.