This is the last USMLE step which most of the applicants take after they match during the first year of residency. You can take this exam after you get the ECFMG certificate. You will need 3 tools to ace the exam:
I-Revision tool
II-Studying tool
III-MCQs tool
IV- Score Table
IV- Score Table
I-Revision tool
1-Master the Boards MTB USMLE Step 3 by Conrad Fischer, is the most common used one for revision.
or
2-First Aid for USMLE Step 3 by Vikas Bhushan
or
3-Brochert's Crush Step 3 by Theodore
X. O'Connell
II-Studying tool
If you recently done with step 2 CK then you don't need a studying tool, you can just use one of the above revesion tools plus MCQs. You may also use your step 2 CK books.
1-Kaplan USMLE Step 3 lecture notes by Kaplan
2-Master the Boards USMLE Medical Ethics by Conrad Fischer
III-MCQs tool
1-Kaplan Medical USMLE Step 3 Qbook by Kaplan
2-USMLEWorld Step 3 Qbank (Online MCQs) from UW
or