hard topics

i mean am not able to watch

It is impossible to answer regarding 'hard' topics, because what one person finds hard other people find easy. All the topics are important because the examiner always examines areas from all areas of the syllabus (and now that Section A is multiple choice questions she is able to make sure that almost everything is tested somewhere in the exam). With regard to your internet being slow, there are really only two alternatives. One is obviously to see if your internet provider can provide faster internet (it might be the provider rather than your country). The alternative is to start the lecture playing but then just leave it. It will obviously keep pausing but if you come back when it has got to the end (which might take a while) and then start it again, you will find that it will then play at normal speed and you will be able to watch it OK. I am afraid there is nothing else we can do. If neither of the above work for you then I regret that you will have to buy Study Texts and study from them.

thanks more blessings

You are welcome :-)