Transfer

I studied as undergraduate student for two years outside the USA in a 100% program. I did not finish the degree.Now to transfer my courses to a university in the US, will they require SAT or ACT or placement test for math and English ? Will they require English as a second language test like TOEFL ? What are best tests to prepare for in my case. thanks

Each place sets its own policies about those exams, so you do need to read through each website carefully.
If the information is not clear, email the International Admissions office, and ask them. If English is not your first language, and you did not study in schools where the instruction is in English, then the TOEFL will almost certainly be required. Start with that one.

While you are waiting, start the transcript evaluation process with WES. http://www.wes.org/