JEE Main

Hello DK,
Preparing for JEE Mains is actually not very difficult at all. This is so because the syllabus for the exam is same as the syllabus for 12th of CBSE. Okay. As you are studying from Patna there may be some changes, so first thing that you should do is to download the syllabus from the site of NTA the new agency that is going to conduct exam for you. After you do this, next stage is assigning time for each subject everyday. You should not skip any subject everyday, in addition you must also assign time for exercise and also some free time for relaxation. You can develop hobby of singing or playing an instrument or meditation. All such relaxing habits are methods keeping fit and keeping relaxed. These are the two important aspects of preparing for JEE. I am sure you will be studying quite hard for this exam and you will do well if you follow these simple tricks. In addition to this when you have studied enough, then it is a better option to give mock tests. These help you in ironing the chinks of the preparation by letting you know where you are falling short.
With this feedback you can do wonders in the exam. Best wishes to you.

Well, it pretty much depends on your level of preparation and confidence. If you are sufficiently high on confidence, JEE, BITSAT and your state's entrance exam are enough. If you're not very confident, you could go for easier entrance exams such as VITEEE (For admission into the Vellore Institute of Technology), Amrita Engineering Entrance Examination AEEE for admission into the Amrita School of Engineering) MU-OET (for admission into Manipal Institute of Technology), along with the above-mentioned ones. Just don't register for too many exams as it could
lead to frustration at that time
Depends on your confidence.
JEE Main
JEE Advanced
NESTE]
National Entrance Screening Test (NEST)
ISIAEE]
Indian Statistical Institute Admission
CMIAEE]
Chennai Mathematical Institute Scholarship
SCRA - railways
Private colleges-
BITSAT
VITEEE KIIT
COMED-K
COMEDK
IPU-CET
Manipal
VITEE
AMU
Aligarh Muslim University
State Level Engineering Exams:
CG-PET
Andhra Pradesh EAMCET
Telangana EAMCET
Gujarat-CET
BCECE
IISC-Bangalore
COMEDK UGET
JK-BPEE CET
Karnataka CET
K-CET
KEAM
KEM-CET
RPET
Odisha -JEE
JCECE
UP-SEE
Goa CET
WB-JEE
Tripura JEE
KIIT
Assam CEE
MAH CET.