Is practice test 148 harder than other tests or is it just me. I've been pretty steady around the low 160's range and then I took test 148 and i dropped to 157. Is it my abilities or is practice test 148 actually just harder?

I've been getting around a 156 on my practice LSAT's with my blind reviews in the 165-166 range. Is it possible for me to get over 160 for the October LSAT? I've been told my problem isn't the content, its timing and consistency. Is this truly what it is?