Critical reasoning presents tests takers with questions about each argument. The most popular question is how to strengthen the argument or how to weaken the argument, in other words, introduce new evidence that makes the arguments stronger or weaker. Other questions might be to supply a conclusion, mimic the argument's reasoning, find the assumption, and infer information from the argument. Mapping out the argument is the key to understanding critical reasoning. On should find premises, assumptions, and conclusions.
Premises are the argument's facts.
Assumptions are the unstated ideas. Conclusions result from the premises and assumptions. The arguments can be convoluted. The conclusion might appear as a rhetorical question or a premise might appear as the last line, where the conclusion often appears. To clarify the confusion, map out the argument.