IB Modelling Test Tips Please

Hi All, 

I have a modelling test coming up for an IB role and would appreciate some tips on how to successfully complete it.

From the information I have gathered, the test will look like:

1) A 3 statement model with errors - need to find and fix them, I am assuming errors will be that the model is not correctly linked and major line items will be miscalculated. If there are any suggestions to help with this, that would be greatly appreciated 

2) A simple DCF construction with sensitivity analysis - Any tips would be appreciated 

3) A simple income statement merger - Any tips would be appreciated 

Thank you!