I'm preparing for sat and in need some : ) are there any mistakes in the following sentence? inflation together with the high interest rates andsoaring oil prices are hurting the nation’s economy very seriously.

Wow. All I could mention is that the predicate (verb) of the sentence should match the number of the subject (noun). Since the subject is "inflation", the verb should be "is", not "are".

There should also probably be commas after 'Inflation' and 'prices'.

To be honest i don’t know