Usually the questions in simulator mention, if it is to be calculated to original budget or it would say original budget is not valid, so calculated TCPI for new forecasted value. usually very clear.
The question will provide you with all of the variables you need to select the correct equation or it will be a 2-step problem solving question. On my PMP exam, however, I did not encounter any of more advanced formule though.
How can i pick the right function to the question?
for example:
TCPI - (BAC-EV)/ (BAC-AC) OR (BAC-EV)/(EAC-AC)
What question should be asked in order to understand what to choose?
Training for Project Management Professional (PMP)®, PMI Agile Certified Practitioner (PMI-ACP)®, and Certified Associate in Project Management (CAPM)®