GIVEN sentence. HENCE, 'R' is the first part.The word ''exhausted'' mentioned in the sentence 'Q' is linked with the word ''taxing'' mentioned in the sentence 'R' because if the work is difficult then only you will get tired. Hence, 'Q' follows 'R'.Exhausted(ADJECTIVE) - extremely tired.For Example - Exhausted, they fell asleep.Taxing(adjective) - difficult or needing a LOT of thought or effort.For Example - I just need an entertaining read for the beach - nothing too taxing.The phrase ''right strategy'' mentioned in the sentence 'P' expresses the reason why the preparation can be tiresome. Hence, 'P' follows 'Q'.The sentence 'S' is the concluding part as it is linked with the sentence 'P'. Hence, 'S' makes the last part. Correct Sentence: Preparing for a competitive exam could be very taxing and could leave you exhausted if the right strategy is not followed during the exam.Important Rules to Solve the Sentence Jumbles:Read the sentences attentively and try to comprehend the idea or theme of the sentences.Try to identify the opening and closing sentences.Try to identify the mandatory pairs. TWO sentences can be connected through various connectors and other determinants.