Sorry to say but IET is among the top government colleges of UPSEE hence it's cutoffs are very high even if you want mech. You need a rank between 1-2k but you coul easily get mechnical branch in other top private colleges of upsee including,

• Ajay Kumar Garg engineering college
• Galgotias college of engineering and technology 
• JSS, Noida
• ABES
• KIET

You can check what other colleges you might get with this rank with the help of upsee colege predictor.

https://engineering.careers360.com/upsee-college-predictor

Good luck