SA 2 Mathematics Key by SCERT. SCERT has released the Maths Key for Maths Summative-2 Exam. Class Wise Key is given below. SA 2 Mathematics Key by SCERT SA-2 Maths Principles of Evaluation. SA-2 6th Exam Key, SA-2 7th Maths Exam Key, SA-2 8th Maths Exam Key, 9th Class SA-2 Mathematics Exam Key.