Hello parijat,
Self doubt is a part of journey and you will face it from time to time. But don't let that block you.
Whatever you have done in past doesn't determine your future. There are many aspirants they have scored marks even lesser than yours , and in their next attempt they have ended up scoring 680+ and got into the most reputed Medical colleges of the country and you can do it as well. You can do it as well. You just need to be disciplined and keep on giving mock test , analyse your mistakes and correct them.
You can also learn along with the team of careers360 using the given website http://learn.careers360.com/medical/neet-preparation-material/

Hope this was helpful for you!
All the best for your future!

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