Please suggest me.
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By definition, VF remoting (like AJAX) is asyncrhonous. As the official documentation states "The remote method call executes synchronously, but it doesn’t wait for the response to return. When the response returns, the callback function handles it asynchronously."
This link would help explain how to use the associated parameters when firing a remoting call -
Depending on what your exact use case is, you may want to handle the behavior appropriately in your callback function.