It is difficult to maintain good concentration if you have to stop to wash or dry the clothes or perform other housework etc. Interruptions from family members can also be a tremendous distraction. Try and schedule your study sessions when you would be least interrupted. Always stay atleast one day ahead of the material covered in lecture. This way you will be familiar with the terminology and have questions that you can ask if the lecture did not clarify a particular concept.
Many students find it beneficial to always read with a pencil in their hand.
This way you can outline the material in your textbook for quick review later. The key to this is outlining. Do not attempt to rewrite your textbook because the authors probably can do a better job of that than you. Making a brief outline of the chapter reduces the amount of re-reading you will have to do. If you can look at your outline and the concepts fall into place then you do not have to waste time re-reading sections you already understand.