Depends on what you have done the whole 365 days. If you have completed the syllabus atleast once, 40 days hard work would be sufficient for revision and you can definitely cross 600 plus.
But if you are starting from the very first chapter, then its practically impossible to secure such a high mark.
There are 97 chapters (biology+chemistry+physics). So its very very difficult to even complete 97 chapters within 20 days if a student hasn not done anything before.
However, for revision, 40 days are sufficient to fulfil your target.

Yes, that is all depends on your spirit. That is , if you study all topics thoroughly then your chances to get 600 is sure. But the revision 20 days is sometimes is not enough. In this case you have to do hard work. And dedication is mandatory. All the best 

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