How can I convert RGB Color to Black-White Color?

Dear everyone!
I am using Photoshop CS5. I have got a file from my customer which is done as RGB and the resolution is 300dpi. There are black texts and color images in the file. I wish to print Black-White Process Film (1 black color), but I don't know how to solve it. I started converting my file to Grayscale and then the black texts are not black enough because it becomes lighter. When I go to Level and adjust the color, both the image and texts becomes darker. What must I do to make only texts blacker without effecting the image?
Please find the attached file for the reference.
For more information, please let me know.
My Best Regards,
LUCK

luck_lesson wrote:
...I have got a file from my customer which is done as RGB and the resolution is 300dpi. ..
What file format was supplied to you? Was it truly RGB @ 300ppi or did you rasterize a PDF?
300ppi is lousy for text. You might converse with your customer to instruct them on the ideal way to supply a file to you.

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