Why do students have to prepare separately for board exams and entrances exams at the same time?

Students have to prepare separately for board exams and entrance exams at the same time because all the exam copies of board exams are checked by the external teachers. When the external teachers check all copies of the students, they observe and read all sentences of the answers line-by-line, intelligency, uniqueness of answer qualities that performed by the students. Based on the performance, all students will be obtained marks in each subject by the external teachers and through the checking, the external teachers will know the abilities of all students that how much have the knowledge and can understand each subject. In class 10th board examination, students will have to balance all the subjects and have to study properly to score better results with better percentages. So that students can be promoted to next higher level classes after the selection of subjects as per the mind of all students then in 12th board examination, students will prepared their subjects and as per the subjects, students will prepared various entrance exams for getting better future colleges and then students will prepared different exams of jobs for the settlement of their future jobs. So, do not waste golden chances as every second, minute, and hour are precious!