That depends on how much you know. For me I like to go through stuff i already have a grasp on to reinforce it. If you find one lesson not helpful at all or do not need the reinforcement then id skip to the next section and do the same test. Ask yourself, "Do I know this material already?" and "How confident am I with this topic?". In my opinion a lot of what the foundational part of the curriculum offers is common sensical but it does have a few genuinely helpful lessons. It may be wise for you to skip ahead to the logical reasoning or reading comp part of the curriculum if this portion feels unnecessary. I'm no expert though just offering my thoughts based on my experience so far.

To break this down I like to think about it as numbers.

1st claim: Let's say there are 30 violinist at the NY Philharmonic that know how to play violin.

2nd claim: There are 1 million violinists in the entire world and more than 50% of them do not play the violin well.

Can we logically make the conclusion that the 30 violinists at the NY Philharmonic are part of the more than 50% of violinists who do not play violin well? Well no we cannot as doing so would require us to assume that the 30 violinists belong to the more than 50% group of violinist who do not play the violin well. The conclusion is based on an assumption that we cannot logically deduce or infer.

I got this correct but am really struggling on timing. Took me around 3 minutes before I submitted my answer with full confidence. Does anyone have any advice for how to save time or improve on time?

I find with this material its main goal is to help you decipher what a sentence means. If you already are capable of understanding the sentences before applying these techniques you will be okay.

#help I got all correct but question 3. I confused the necessary and sufficient conditions. I thought the question was trying to determine the necessary premises for one being infected which in that case would be a week has passed and they have produced antibodies. It appears however that the necessary conditions we are supposed to evaluate are one being infected and a week having passed to determine the sufficient value of one producing antibodies. Can someone help me understand how we can are conclusively decided the necessary and sufficient values in this sentence and what techniques are applied here.

I find the reason A is incorrect becomes clear once you consider the referential. The author's claim is not referring to just any corporation. The author is only making a claim about the corporation's that use motivational poster. We can understand this when the author says "these corporations". In A we're a criticizing the authors claim on a basis that would apply to every corporation but the one's who use motivational posters, which is a poor criticism because the author does not address nor refer to just any corporations not using motivational posters in their argument.

I will say studying the referential and grammar parsing really helped me with getting this answer correct. If you properly parse the sentence and identify the referential every answer is eliminated but one!