Isn't there any other option ?

Dear you can try for some of good private colleges but you have a good calibre of achieving a good rank in jee exam.

Actually I cant take the risk . I will prepare for jee main side by side. well which best private colleges you would suggest ? 

In my opinion ... You can choose from MIT pune, Manipal institute , SRM , Thapar , VIT etc.  
However It is my sincere advice to plz choose government colleges prior to private colleges .... I am a student of NIT kurukshetra  and I have seen people regretting their choices of admission in private colleges ..so think about it.
Feel free to ask for any suggestions :p