body_measurement_1  = body_measurements.where(measuring_date_on: "#{@student.birthday >> 0}".."#{@student.birthday >> 1}")&.last
body_measurement_2  = body_measurements.where(measuring_date_on: "#{@student.birthday >> 1}".."#{@student.birthday >> 2}")&.last
body_measurement_3  = body_measurements.where(measuring_date_on: "#{@student.birthday >> 2}".."#{@student.birthday >> 3}")&.last
body_measurement_4  = body_measurements.where(measuring_date_on: "#{@student.birthday >> 3}".."#{@student.birthday >> 4}")&.last
body_measurement_5  = body_measurements.where(measuring_date_on: "#{@student.birthday >> 4}".."#{@student.birthday >> 5}")&.last
body_measurement_6  = body_measurements.where(measuring_date_on: "#{@student.birthday >> 5}".."#{@student.birthday >> 6}")&.last