For the 2019 paper, a total score of 85+ was good enough for 98-99 percentile and 72+ for 90 percentile.
For the 2018 paper, an overall score of 74+ marks meant 98-99 percentile.
For the 2017 paper, a person scoring between 63+ got 98-99 percentile.
A general overview of the past 3 years SNAP paper is provided below:
Section-Wise Analysis for 2019:
Section 1: General English – A good strategy would be to attempt 29-30 questions with about 85% accuracy by allocating 25-30 minutes.
Section 2: Analytical and Logical Reasoning – A good strategy would be to attempt around 27 – 28 questions with 85% accuracy in 35-40 minutes.
Section 3: Quantitative Aptitude, Data Interpretation & Data Sufficiency– A good strategy would be to attempt about 20-22 questions in about 40 – 45 minutes with almost 85% accuracy.
Section-Wise Analysis for 2018:
Quantitative Aptitude and Data Interpretation: It would be good to attempt about 28-30 questions in 40 minutes with 85% accuracy.
Analytical and Logical Reasoning: A good attempt would be around 20-22 questions with 85% accuracy in 35-40 minutes..
General English: A good strategy would be to attempt around 29-30 questions with 80-85% accuracy in 30-35 minutes.
The notable point about SNAP 2017 was that it was moderate but very lengthy. The marking scheme was +1 for every correct answer in MCQs.