please provide some strategy to choose a right question/set/RC

From my point of view, I will suggest you first attempt DILR sets having 4 questions. They are easy compared to 5 question sets. Look for topic that you are more familiar with. Also, you can try attempting the ones with MCQs first, rather than going for TITA type as TITA types are usually more difficult than MCQ types.

1. it actually depends on your strengths and weakness , topicwise.
2. you can skip a question if even after 1 minute you are not able to eliminate any options/move forward.
3. For RC's question types such as assumption/application are difficult for most students so you can skip them