Requires:

Eating healthy requires eating an adequate amount of fruits and veggies every day.

Eating Healthy --> Adequate Amount of F and V

(If I want to eat healthy, then I have to eat an adequate amount of fruits and veggies every day)

Required:

2. The LSAT is required by all the top law schools that I want to attend.

Top law schools that I want to attend --> LSAT

(If I want to attend a top law school, the LSAT is required)

So I'm just gonna make something up to (hopefully) help you out here...say we have the following:

Unless I finish my homework tomorrow, I will not go to the mall on Thursday.

I finish my homework tomorrow = A

I will not go to the mall on Thursday = B

We could rephrase this as the following:

I will not go to the mall on Thursday unless I finish my homework tomorrow.

In this case, I would negate everything before 'unless' (B), which is the sufficient condition, and everything after 'unless' is in the necessary.

Which gives us the following:

If I go to the mall on Thursday, then (this means) I will finish my homework tomorrow.

It helps to rearrange the sentence so the 'unless' is in the middle, but you could also just apply the negation technique when unless is in the beginning of the sentence. You would get the contrapositive, as follows, for the following statement (Unless I finish my homework tomorrow, I will not go to the mall on Thursday):

If I do not finish my homework tomorrow, then I will not go to the mall on Thursday.

which is the same as "If I go to the mall on Thursday, then I will have finished my homework tomorrow"

A couple things:

What kinds of questions are you getting wrong? Is a mix of inference, attitude, strengthen/weaken questions? This is a good starting point.

How long are you taking to read the passage? It's helpful to spend more time on the passage to really get a solid grasp of what's going on before going into the questions -- I spend anywhere from 4 to 5 minutes at times, and even though that seems like a lot, I end up breezing through the questions in about 3-4 minutes with minimal difficulties.

the second LR section was just released when PT90+ came out; so because LSAC hasn't technically released the license out to 7sage, 7sage can't post the second LR section on here

the whole point of reading the stimulus first and coming up with a CLIR/Loophole (before reading the question stem) is so that you get faster at analyzing arguments in the future, no matter what kind of question stem comes to you - SA/NA/conclusion/Argument part/etc.

The same applies for argument part/conclusion questions. The more you CLIR by reading stimulus first, the better and faster you'll get it.

I wouldn't worry so much about timing at this point if you have just started problem sets. If it takes you a while to understand and comprehend the stimulus, that's fine! That's the key to understanding what is going on in the argument. If you're focused on time, that'll prevent you from really taking the time to understanding the stimulus. The more time you spend really understanding a stimulus, the faster you will get at answer questions over time.