@ravi gamage - Perhaps you could read the PDF on the Kindle. You'd probably need to reformat it to Kindle size, K2pdfopt can do that - google will find it, its free.
Not sure how if it can handle the font, or if it will handle the tables - but it wont cost anything to try.
If the 'book' is protected by commercial copyright you should remove the link you posted - I've no sinhala, so I cant tell. Mobileread is very strict about copyright protection.
BR
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