You can’t know absolutely everything that is testable on the bar exam. But, you can (and will) know most of it.
Most bar companies will give you big outline books. You don’t need to know everything that is in those outlines. You also have your lecture notes. Focus on those. The bar companies will give you the most important (most heavily tested) material in lectures. It won’t be absolutely everything, but it will be enough. Spending a lot of time outlining from, or trying to know everything in, the big outline books is not a good use of your time.
You will also learn new rules through essay and MBE practice. This can be very anxiety-producing for bar studiers. However, it is all part of the process, and you’ve got to trust the process. Take what you learn from your practice and add it to your lecture notes. That will be what you memorize from.
Strong students find it particularly stressful to not know exactly what you will be tested on. But, this isn’t a law school exam with a closed universe of testable material. The universe for the bar is enormous. There will be something you don’t know. But, that’s ok. You will still pass.