ahmed emam

Hello everybody I need your advice as I don't know what to do I have 4 years of research experience in Cancer Biology, my cGPA is 3.35 out of 4, my GRE score is V148 Q157 AW2, my TOEFL is 90 (R23 L23 S20 W24), I have 5 conference publications and 1 published paper, also I have 2 papers under publications. I am studying GRE now to improve my score for reapplying next Fall, but do I have to retake TOFEL test? and what score range to be considered as safe score for both tests. BTW I am not planing for high rank university. I am planing for a university in the range of 75-150 over USA university ranking Thanks in advance and any advice would be more than welcome