You cannot change the order the tables are imported. Oracle's import utility will import the tables in the order they were exported. Oracle's export utility will export the tables in alphabetical order for each schema.
That being said, you can import one table's records at a time with the TABLES parameter for the imp utility. So you do have some control. But you will have to run the imp utility for each table if you want to control the import order. So if you have 20 tables to import, you will be running imp 20 times.
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