1. bio exercise 1 49분

2. bio exercise 2 47분

3. bio exercise 3 mitosis 53분

4. bio exercise 4 meiosis 36분

5. bio exercise 5 cell respiration 48분

6. bio exercise 6 gene express 40분

7. bio exercise 7-1 genetics 24분

8. bio exercise 7-2 genetics 34분

9. bio exercise 8 34분

10. bio exercise 9-1 31분

11. bio exercise 9-2 19분

12. bio exercise 10-1 21분

13. bio exercise 10-2 20분

14. bio exercise 11 46분

15. bio exercise 12 45분

16. bio exercise 13 48분

17. bio exercise 14 29분

18. grammar exercise 1_1 26분

19. grammar exercise 1_2 26분

20. grammar exercise 2-1 29분

21. grammar exercise 2-2 18분

22. grammar exercise 3-1 30분

23. grammar exercise 3-2 25분

24. grammar exercise 4-1 27분

25. grammar exercise 4-2 22분

26. grammar exercise 5-1 25분

27. grammar exercise 5-2 19분

28. grammar exercise 6-1 25분

29. grammar exercise 6-2 25분

30. grammar exercise 7-1 19분

31. grammar exercise 7-2 23분

32. grammar exercise 8-1 21분

33. grammar exercise 8-2 21분

34. chem exercise 1 40분

35. chem exercise 2 42분

36. chem exercise 3 38분

37. chem exercise 4 31분

38. chem exercise 5 44분

39. chem exercise 6 37분

40. chem exercise 7 mole 1 62분

41. chem exercise 8 mole 2 48분

42. chem exercise 9-1 enthalpy 7분

43. chem exercise 9-2 enthalpy 11분

44. chem exercise 10-1 38분

45. chem exercise 10-2 18분

46. chem exercise 11-1 10분

47. chem exercise 11-2 15분

48. chem exercise 12-1 4분

49. chem exercise 12-2 28분

50. chem exercise 13-1 acid base 30분

51. chem exercise 13-2 acid base 23분

52. chem exercise 14 acid base 3분

53. chem exercise 15 redox 34분

54. chem exercise 16 37분

55. 1 org chem exercise bond theory 1 28분

56. 2 org chem exercise bond theory 2 24분

57. 3 org chem exercise functional group 1 29분

58. 4 org chem exercise functional group 2 18분

59. 5 org chem exercise isomerism 1 30분

60. 6 org chem exercise isomerism 2 22분

61. 7 org chem exercise organic reaction 1 20분

62. 8 org chem exercise organic reaction 2 26분

63. 9 org chem exercise prot carb lipid 26분

64. 10 org chem exercise acid and base 1 19분

65. 11 org chem exercise acid and base 2 17분

66. 12 org chem exercise ring structure 1 21분

67. 13 org chem exercise ring structure 2 17분

68. 14 org chem exercise nomenclature 1 25분

69. 15 org chem exercise nomenclature 2 23분

70. 16 org chem exercise short review 1 21분

71. 17 org chem exercise short review 2 19분

72. 18 org chem excercise common name 23분