MATLAB: How can I use sheet name as plot title in multiple sheet excel file

sheet name as plot title

My code is running through multiple excel sheets in an excel file, and is making plots according to each sheet, also I am having many excel files to analyze. 1. I want the title to indicate the sheet name of the respective plot. 2. My excel file has 10 sheets. I want 6 figures in one page, that is two pages for one excel file using subplots. my code plots 6 figures in the first page and do not create second page for the same excel file and gives error. My code looks like this:
clc;
XLfile = dir;
number_of_files = length(XLfile);
index = 3;
for index = 3:number_of_files
    filename = XLfile(index).name;
    for i=1:12
     x=xlsread(filename,i,'C2:C10000');
     y=xlsread(filename,i,'D2:D10000');
     subplot(3,2,i)
     plot(x,y,'b')
          xlabel('Shear strain (%)','FontSize', 8)             
          ylabel('Shear stress ratio (\tau^{\prime}/\sigma_{vo}^{\prime})','FontSize', 8)
          title(filename(1:end-4)) 
          set(gcf, 'PaperPosition', [0 0 5 8]);  
          set(gcf, 'PaperSize', [5 8]);          
          saveas(gcf,[filename(1:end-4),'pdf'])
      end   
  figure
end
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