I empathize with you, candy. When I was studying, I had a 149 diagnostic, then a 152, and 158. I was so excited to be going up so quickly but then reality set in. I got a 156 on my next PT then a 154!!! I actually ended up getting several 154s and towards the end I was back at 158/159 but not breaking the 160 I so desperately wanted.
There were low points during which I was giving up hope, I stopped studying and I wasn't taking everything seriously enough but my boyfriend and family were very encouraging. After getting a 154 for a third time, I was in tears and my boyfriend said "when you fall off the horse, you have to get right back on otherwise you'll never get on again." This is absolutely right. I reminded myself of this constantly and kept pushing through, but I never broke 159 on a practice test. At some point an instructor joked that I only needed to break 160 once and to make it count, and I took it to heart.
I got my February score on Friday, a 162! I was literally screaming with delight...I went to call my parents and accidentally called a stranger, yelling into the phone that I got a 162. good times.
When it came down to the weeks leading up to my exam, I did two timed sections a night (one logical reasoning and then alternating reading comp and games) as well as one PT per week. It really helped me nail down my timing and my results got higher and more consistent when I did that. This might not be the best strategy for you personally but I wanted to share my tactics in case this is something that might help you.
Just know that you absolutely can break past 160. It just takes time, practice, and patience. I am not a good test taker (the SATs were a debacle), but that's just not an excuse for giving up hope. I am a firm believer that practicing standardized tests will result in improved scores and you just have to practice enough. As that stupid joke goes, the best way to get to Carnegie Hall is practice, practice, practice. We can easily apply that to law school
Everyone experiences lulls in reaching their goals and suffers from slumps and setbacks. Not everyone has the courage to keep pushing forward but those who do persevere. Have the confidence and strength to know that you can get past your slump and reach your goals.