Hey Abhishek,

Sorry to hear about your condition, but relax I help you with your doubt. As you have said that you are taking coaching for engineering entrances...so let me tell you that there are various engineering entrances which you can apply.

1. JEE MAINS

as you know, for studying in any engineering college jee mains is a must exam whether it is a state or national college. But if you are thinking of jee advance then sorry you can't sit for it but you can get NITs if you have 75% mark or above than that in your 12th. 

2. ICAR AIEEA

You can go for AIEEA which is under the ICAR can register for non-biological course such as forestry, ag.tech, and various other non biological field. 

3. Other engineering entrances

There are many other engineering entrance exams such as

1     BITSAT (http://www.bitsadmission.com)

2 COMED-K (https://www.comedk.org)

3 IPU-CET (B. Tech) (www.ipu.ac.in)

4 Manipal (B. Tech) (https://manipal.edu/mu/academics.html)

5 VITEEE (www.vit.ac.in)

6 AMU (B. Tech) (http://www.amucontrollerexams.com)

4. Defence entrance exams

a. Indian Maritime University Common Entrance Test

You can get Admission in Diploma in Nautical Science (DNS) leading to BSc. (Nautical Science)

Eligibility - you should have Class 12 (PCM)

Application mode - Online

Source: www.imu.edu.in/index.php

b. Indian Navy B.Tech Entry Scheme

You can get Admission in Indian Navy B.Tech course

Eligibility - you should have Class 12 passed

Application mode - Online

Source: https://www.joinindiannavy.gov.in/

c. Indian Navy Sailors Recruitment 

You can take Admission in 24 weeks Basic training at INS Chilka followed by Professional training

Eligibility -you should have passed your Class 12 (Maths and Physics/Chem./Bio/Computer Sc.)

Application mode - Online, By Post

Source: https://www.joinindiannavy.gov.in/

Defence 

d. Indian Army Technical Entry Scheme (TES)

You can get Technical Entry to Army

Eligibility-Class 12 PCM

Apply-Online

Source: www.joinindianarmy.nic.in/

e. National Defence Academy and Naval Academy Examination (I) 

You will get Admission to Army and Air Force wings of NDA and 4 years B. Tech course for the Indian Naval Academy Course (INAC)

Eligibility- Class 12, 12 Passed

Application mode - Online

Source: www.upsc.gov.in/

So these are all possible lines if you want to take. Other than this line there are many other lines in which you can go through such as fashion designing and etc. If you want to know more feel free to ask.

Thank you