How to add values to the array using 3 select queries in sql and php

There is a question pool.

question{ question_id PRIMARY KEY, question, option1, option2, option3, option4, level_id FOREIGN KEY, category_id FOREIGN KEY }

exam_paper{ exam_paper_id, exam_paper_name, level_1_no_of_questions, level_2_no_of_questions, level_3_no_of_questions } exam_paper_questions{ id PRIMARY KEY, exam_paper_id FOREIGN KEY, q0, q1, q2,q3, q4, q5, q6, q7, q8, q9 }

there are 10 questions in the question paper. there are 3 levels of questions like easy, intermediate and difficult. I want to add 3 questions from easy level(level 1), 4 questions from intermediate level(level 2) and 3 questions from difficult level(level 3) randomly selected from the question pool into the exam paper. How to write the query? and how to insert to the questions to paper?