run_ts.rb

require_relative "test_reader"
require_relative "test_scores.rb"

read_class= TestReader.new
read_class.parse_data
read_class.student_grade
read_class.test_score

test_reader.rb

require 'csv'

class TestReader
  attr_reader :parse_data

  def initialize
    @student_grades = []
    @student = {} 
  end

  def parse_data 
    CSV.foreach("test_scores.csv", :headers => true) do |row|
      @student_grades << row
    end
  end

  def student_grade
    @student_grades.each do |student|
    @student[student["Name"]] = student["Grade"].to_i
    end
  end

  def test_score
    TestScores.new(@student).student_bracket
  end
end

test_scores.csv

test_scores.rb

require 'pry'
class TestScores
  def initialize(student)
    @student = student
    @bracket = [] 

    @high_grade = []
    @medium_grade = []
    @below_avg = []
    @low_grade = []
  end

  def student_bracket
    @student.each do |grade|
      bracket(grade)
    end
    bracket_message
  end

  def bracket(grade)
    if grade[1] >= 90
     @high_grade << grade
    elsif grade[1] >= 80 && grade[1] < 90
     @medium_grade << grade
    elsif grade[1] >= 70 && grade[1] < 80
     @below_avg << grade
    else
     @low_grade << grade 
    end
  end

  def bracket_message
    puts "=== >= 90 ==="
    @high_grade.each do |student_grade|
      puts student_grade[0]
    end
    puts "=== >= 80 ==="
    @medium_grade.each do |student_grade|
      puts student_grade[0]
    end
    puts "=== >= 70 ==="
    @below_avg.each do |student_grade|
      puts student_grade[0]
    end
    puts "=== < 70 ==="
    @low_grade.each do |student_grade|
      puts student_grade[0]
    end
  end
end