Can you suggest me which is the best book for SELF STUDYING - theory of machine , material science , strength of material ,thermodynamics .

I AM CURRENTLY DOING BTECH IN MECHANICAL BRANCH FROM UPTU , I HAVE CLEARED MY 1ST YEAR, KNOW I WANT SOME BEST BOOKS FOR FURTHER STUDIES , RECOMMEND ME THOSES BOOKS THOUGH WHICH I CAN UNDERSTAND THE TOPICS EASILY MY SELF .(MEANS FOR SELF STUDING HAVING EASY LANGUAGE )