i have an interview for the role of CAD MODELLER (STRUCTURAL TRAINEE) and i am to do a job specific aptitude test and i have never done one before, can someone give me any tips or ideas on what to expect as im worrying myself a lot about it! Thanks!

If you know Solidworks well enough why would you be worried?  They just want to know if you actually live up to what you state in your CV.  Well.....can you?