Eamcet is one of the most important Engineering entrance examinations where ignoring a single chapter won't help you to crack the exam. However, some do or die chapters or the chapters of Physics which carry more weightage are Systems of Particles and motion, Laws of motion, Motion in plane, Work Power and Energy, Thermodynamics, Moving Charges and Magnetism, Current Electricity, Electrostatic Potential and Capacitance, Oscillations, Gravitation, Waves etc. Most of the questions come from these chapters or sections. So focus more on these chapters during last days preparation. Also solve previous years exam papers where you can get an idea on what type of questions are actually asked. http://engineering.careers360.com/articles/ts-eamcet-answer-key