Brilliant pala is the top coaching centre in Kerala and these study materials are only given to students inside the centre no matter what. Study materials alone costed me about 20k which makes each of these books around 1200 rs. These are extremely new since I got two copies (one online and one offline). These are lowkey the best in market. contains;
-summary of each chapter
-imp points and equations
-level 1,2,3 questionaire
-key for these questions

(other subjects are also available, also leave a message if whole package is needed for discount)