If you want additional problems to work on the original collection of problems is here. Of course, there can be some overlap.
1.1: 1-5, 6(a, c, e), 7, 8; 1.2: 1-4, 5a-f, 6(b, d), 7, 8, 12, 16, 18, 19c; 1.3: 1, 2, 4, 10-13, 14(a, c), 27-30;
1.4: 1-8, 9(a, e, g), 10, 11; 1.5: 1, 3, 4, 5, 9, 10
2.1: 2, 3, 4, 5, 6; 2.2: 1, 2, 3, 4, 7;
3.1: 1, 3, 4, 5, ; 3.2: 1-6, 8-11, 14; 3.3: 1, 2, 4, 6, 7, 10; 3.4: 1, 2, 3, 4, 5, 10, 11, 12, 14; 3.5: 1-10; 3.6: 1, 2, 4, 8;
4.1: 1, 2, 4, 5, 6, 7, 8, 10, 16, 17, 18, 21, 23, 24 ; 4.2: 1, 2, 3, 4, 6, 7, 8, 11, 12, 16 ; 4.3: 1, 2, 3, 4, 5, 6, ;
6.1: 1a, b, c, f, g, h, l ; 6.2: 1a-e, 2a, b; 6.3: 1, 2c, 4a, 25a, b ;