You can print the same practice tests from the college board website.

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2. SAT Questions and Feedback
3. Printing SAT

That exists on the college board app. 

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2. SAT Questions and Feedback
3. New Idea

You can print the reading passages from the College board website. The practice tests on there are the same as on Khan Academy. I'm not sure what you mean by "optional timers," but I have found tha...

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2. SAT Questions and Feedback
3. Reminder: Print Passages and Timer

There is already a distinction (though subtle): a calculator symbol shows up in the upper left corner for calculator questions and the same symbol with a line through it for non-calculator questions. 

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2. SAT Questions and Feedback
3. SAT Math Separate parts into Non-calculator/Calculator