Ram, MHRD has requested for suggestions regarding reduced syllabus for Academic year 2020-21. And no syllabus has been finalised yet. This is going to take some time. And so it is too early to talk about Board exams already. So we need to wait to hear from the official sources because anything that we say at this point in time is just speculative.

Hii!
Till now, there hasn't been any official announcements about any changes in the syllabus kr certain portions of any of the Subjects in class 10th CBSE board. So, you don't need to worry about it. May be in times to come, the syllabus may reduce due to the delay in session start because of Covid-19 pandemic and the lockdown. But, as for now, there's nothing like that.
Hope this helps.
Good luck!