Hi guys, I just want to share some of my experience and what I did to improve rom 158 to 168 in 2 weeks, and hope this will help some of you :)
I started studying for LSAT back in June. My very first cold diagnostic was 163, I focused on CC and hoped that once I finish the CC I would be in 170 range. Well... That's not what happened.
The thing I didn't realize that until now is that LSAT is an actual EXAM, not a thing where you just use algorithm to solve. In another word, the skills you learned from CC should be used flexiblelly rather than mechanically when solving problems. I noticed that starting PT 70, LSAT LRs are significantly more difficult to parse, if you are like me who just mechanically use rules, then you'll have a hard time getting through the section under 35 minutes. You should definitely try developing your LSAT intuition as you learn, not just mechanically apply rules.
Drill by questions types definitely helps. I was frustrated and disappointed at myself for consistently missing 10 questions per LR section that's -20LRs per exam!!! Drill by questions types, read each explanation very carefully. If you don't understand JY's explanation completely, google questions and head over to Manhattan, PowerScore forums for helps. There's no such thing as the best explanation, you should study whatever that helps you.
Don't lose hope, and try to be hopeful. I thought I was never gonna break 165, but here I am. Everything is possible, given that you study right. And by study right, you have to figure out what method works for you, rather than mechanically sticking other people's method. It was definitely a long and difficult journey for me from June, but nonetheless I've learned so much from JY and all the 7Sagers here on the forum and in the comment sections. I couldn't do it without you guys. GOOD LUCK!
Let me take a shot at your question:
"a and b not both in" is basically saying that at least one of a/b is out. This is not quite how biconditional works. I come from philosophy background. Here's how biconditonal works in formal logic. biconditional is true if and only if two things agree on truth value so technically
F bicond F is a true biconditional.
On the other hand
T bicond F or F bicond T are false biconditionals.
However, F bicond F, T bicond F and F bicond T are all acceptable situations in "a and b not both in" So, I probably wouldn't set up the games using biconditonals, instead I'll just interpret it as at least one is out.