correct:
When you choose a college to attend, you should spend sufficient time learning about the programs offered there. When it is time to tell your parents about your top choices, you need to support your assertions with specific details. Do not misrepresent the university, but carefully present your opinion. Who knows? They might end up thinking your top choice was really their idea all along! If you don't do this, the alternative could be miserable.
collage - college
their - there
ascertions - assertions
misrepersent - misrepresent
there - their
ideal - idea
alternetive - alternative
I could only find 7, sorry.
Two resources are online checking websites, like Grammarly and you can also have someone else proofread your writing.