i have more parts in score if i render a pdf , lower parts are cutting i mean its not coming in pdf , what resolution should i use

It is not a resolution problem but a page size/scaling problem. Read this bit of the handbook to see controls available. https://musescore.org/en/handbook/4/formatting

So many parts do not fit on an A4 page. Simply use the page size A2.
Or reduce the staff spacing until they fit on A4. The result is the same: a much denser presentation.

The A2 PDF can also be printed on A4 paper. The print dialogs usually offer scaling or the option to automatically reduce to the existing paper format.
But how legible is it then? An A3 printer would be useful here, then the reduction in size would still be acceptable.