You should investigate automatically low tenders by clarifying the bid with the supplier. It could be they have misunderstood the requirement. Or the bid could be genuine and they can really provide best value for money.
But without enquiring, you just don't know.

The three pillars of sustainability are profit, people and planet. This may also be referred to as social, economic and environmental.

energy, agriculture, metals, livestock are the four trading categories on the stock exchange. Some-times there's a 5th category added which is 'environmental credits'. This is a fairly new thing and you don't need to know anything about this for this exam.
Question no commodities will mainly centre around characteristics of commodities and factors that affect pricing.
Commodities are discussed much more in detail in L5M4. At level 4 you just need a basic overview.

Gearing measures how much of an organisation's long-term funding is made up of long term debt and loans.
Therefore the correct answers are 'shareholder equity' and 'long term debt'.
There are many question about financial ratios that can come up on the exam. If you're unsure on them I suggest doing further reading outside of the study guide as this will help. I like this youtube video (I'm not associated with the makers of this video but think they're really good at explaining things to beginners) Gearing Ratio explained (youtube.com)

The correct answers are; suspiciously low labour costs, workers living on site and poor quality products (as this signals that the workforce may be unskilled).
A low score on the CPI is a good thing (high scores are more likely to signify slavery concerns) and just because someone speaks English as a second language doesn't mean you automatically need to be suspicious.
That would be prejudice.