Hello,

I am sure you mean IISc and IITs instead of IIITs. Now assuming that I would like to tell you that your preparatory rank is not very good and hence your chances of getting a seat in IITs is very very less. Coming to IISc, since you have not actually qualified JEE Advance, the preparatory students are those who have shown the potential but couldn't clear the cutoff in order to feature in the common rank list. 

For IISc your rank should be right at the top, thus you have no chance in IISc or IITs with this rank. I hope I have cleared your doubt. Feel free to comment down your queries.

Thank you