Going by my own analysis, i can say that for CSAT Vision and Insights IAS answer keys are the most accurate. One answer (financialisation of households) is given wrong in Vision coz when seeded from Source article, it says all options are correct. For RCs , you can refer to Rajeev NV. His answer key matches with Insights and Vision except the above-mentioned question
On a scale of 1 to 10, how much will you rate Insight’s csat key in terms of accuracy and correctness, specifically for passages?
I attempted 36 Qs out of 80 in csat paper( 12 from Quant plus LR, 24 from RC).
Acc to insight ka key, out of 36 attempted, 34 are likely to be correct and only 2 are likely to be incorrect; and this is impossible for me to believe ki csat mei meri itni accuracy ho sakti hai 🥲