I posted an answer that has links to resources on how to prepare for TOEFL in <1 week.
I can vouch for this approach since I myself used it and got 108/120.
https://gmatclub.com/forum/toefl-or-ielts-398634.htmlTLDR - If you studied English during school, you do not need a course
Like for Indian students and applicants - English is taught in CBSE and ICSE, so you'll be just fine in TOEFL.
Also if you have prepped for GMAT or GRE, you already know most of the stuff.
Feel free to ask me any further questions you guys might have. I was very bothered about TOEFL before the exam, and can understand if others are going through the same right now.