With your Class 12 marks of 90% and JEE Main rank of 345,000, you may face challenges getting admission into top IPU colleges, as most of them have higher cutoffs. However, as a Sikh minority candidate, you may have an advantage in some colleges that reserve seats for minority communities. You can still apply, especially to less competitive programs or colleges within IPU. It's advisable to check IPU's specific eligibility criteria and cutoffs for better clarity.

For more details you can visit the link given below

https://engineering.careers360.com/ipu-cet-counselling-college-predictor