Hello,

You said that, your coaching center is teaching you another chapters and you want to revice the previous chapters.  So according to me,  make a schedule of your own as per your own convinince when to revise which chapter like for example if your coaching center is teaching  you chapter nine of chemistry and had given you one home task,  then ultimately you have to finish it but make a proper schedule by which you can also practice some or few of the questions from chapter seven suppose and then complete the home task of your coaching.

Hope you understand.

Thank you!