Before you submit your query to Pitch Wars, make sure it has the following:
The protagonist's mission.
What's at stake. What will happen if they don't accomplish their mission?
The person or forces trying to stop them.
A clear sense of genre and tone that matches your book.
It should read like back cover copy--brief, catchy, just enough to get us interested.
As few proper nouns as possible.
Have it read by someone who is unfamiliar with the project. Make sure it makes sense to them.
Project word count, and make sure your word count is industry-appropriate.
Any points of special interest or unique qualifications you may possess. For example, if your book is about a lawyer and you are a lawyer, go ahead and say so.
Here are your mentors' successful queries. I recommend seeing if the mentors you're subbing to are on here and getting a feel for their style. It might help you tailor your query or at least know what their writing personality is like!