Rohit is a 15-year-old student who has been struggling academically despite his intellectual capabilities. He consistently demonstrates a high level of intelligence and critical thinking skills. However, his grades do not reflect his potential. Rohit often procrastinates on assignments and fails to complete them on time. Additionally, his test scores are consistently below average. His teachers and parents are concerned about his academic performance and are looking for strategies to help him succeed. How long has Rohit been experiencing academic difficulties?