I need help in these levels

Product Street 7, Spice Street 1, Packing Lane 2, Sour Cream Street 1.
I can never get GOLD in these levels I can only get Silver in these levels.
I would be glad if you can help me with these levels.

Tips on these levels are posted with the level headings. Some of these are duplicates of other posts so I listed the levels in the name to make them easier for people to find.