Foundation
USE WHEN
Passing percentage, marks short/excess, maximum marks or two students' outcomes are linked.
BEST METHOD
Difference Equation Method
TARGET
60–90 sec
MASTERY
not started
Passing percentage, marks short/excess, maximum marks or two students' outcomes are linked.
Translate every mark condition into a percentage of total maximum marks.
When two candidates miss/exceed pass marks by known amounts, subtract their percentage equations.
Use the score gap between two candidates to eliminate the pass mark.
Timed drill
Identify the base or invariant before you calculate.
Attempt first · Standard Example
Attempt first · CAT-Level Example
3-level practice ladder
Foundation
CAT Standard
Advanced / Hybrid
cat 2020 slot 3: exam scores given as percentages with mark differences used to reconstruct another score.