TOEFL

you have to do lot of practise. Instead of ToEFL you can do IELTS. take coaching and then write exam

SAT is accepted by BITS pilani and may be in future few more private universities will start with it. If you are keen to join USA for further studies, you may take SAT in grade 11 beginning as it will be the best time to start process of applying abroad.

Hi, TOEFL is not mandatory but for GRE requirements you must check the university websites as requirements differ.

Hello, TOEFL is a test for English language proficiency, the duration of the test is four and a half hours. You can visit ets.org/toefl for details such as registration, test fee, test centers etc.You need to create the online account on the site as well so please check the website.You must also take the SAT which is an aptitude test.Your high school grades are on the lower side so do well on SAT and TOEFL.
Regards

Dear Sanath,
They are tests for English language proficiency. You can read more about it on ielts.org and ets.org
Coaching classes are good, but most students take self study lessons from online coaching materials available on these websites.

IELTS is best exam for abroad study.

GRE(graduate record examination) it is exam which is needed for MASTERS in abroad
and TOEFL is a exam needed when you are going abroad for work or study. TOEFL is must needed for checking of ur fluency in English.

ToEFL and IELTS. is an exam to prove English language proficiency when you are going from non English speaking country to an English speaking country. ToEFL is an online exam. IELTS is you have write it in pencil. Both has four modules as Speaking Listening Writing and Reading papers.

Hi Bhaiswajyoti,
TOEFL IBT test is scored on a scale of 0 to 120 points. You need to visit https://www.ets.org/toefl for more details.
Good Luck!