More info would be helpful e.g. grades/GPA/rank in school, why you want to go to BS, why (only) Lawrenceville, whether you are URM, need FA, etc.
The conventional wisdom here is that unless you have a really solid, happy-making Plan B (e.g. a great local high school you’d be more than happy to attend) you should apply to more schools including a few with meaningfully higher acceptance rates (30-50%).
Also probably worth checking out this post I made a while back. Still applies: