When you come across equations where a variable's value needs to be found. The correct answer will be the one that satisfies the equation after substituting the values from the four options.
Analyzing dimensions is a key strategy in Physics. If a question asks you to calculate the value of speed, remove any answer that doesn't have m/sec as a dimension.
Identify topics that will help you fetch maximum marks. Focus on chapters such as Modern Physics relating to atoms, nuclei, and radiation.
Inorganic Chemistry questions are often directly sourced from NCERT textbooks. Therefore, thoroughly study NCERT books.
When you have ruled out two options, you can rely on the remaining two by either using the method that avoids extreme values or by the dimension strategy for units or values.