Hello Suraj,

               Thanks for writing this to us. We will be pleased to answer you. Yup, you are going in the right track. There is no alternative to Mock Tests. You are an Engineering Aspirant. You should give Mock tests to check your condition; how much preparation you have, self-assessment is very much needed in these exams.

• There are many Online Mock tests available in the market. but some of them are free.
• But the free tests are not of the quality that you need to check. They will ask some basic questions on theory,2-3 numerical questions. After that, the test gets over. so you can assess yourself on the basis of this test. 
• Sometimes you can submit the answers only after some registration process.
• In today's world, no one will provide you free mock tests. If you want a quality test then it is better you should join some institutions providing such tests. You can opt for Online/ Offline.
  
• Before that please verify their authenticity and past track records, it will be useful to identify the right one.
• You have to pay some amount of fees. it depends on them how much they charge.
• Before going anywhere else, just check our link https://engineering.careers360.com/articles/jee-main-mock-test. It will have a clear view of these exams.
• Just a reminder, NTA is conducting Free Mock Tests for JEE MAINS candidates. You can go there and get familiar with it.
  
• But to improve your quality don't depend only upon this NTA free Exam.

Best of Luck for your Exam!

Feel free to ask any question.....

Regards,