My rank is 742 with 145 marks in CEE(general category). Will I get CSE in Jorhat Engineering and Electronics in Assam Engineering College

Yea there is chances of 80 percent and rest hope for the best

The  Assam CEE (Combined Entrance Test) is a state level examination regulated by the Assam Science & Technology University (ASTU), Assam. This examination is a gateway for those students seeking admissions in engineering courses like B.E. Different colleges & institutions of the state of Assam consider the Assam CEE score for providing admissions in engineering courses. Assam CEE examination is conducted one time in a year.
The cutoff for Assam Engineering College and Jorhat Engineering College is around 130 marks from total 480 marks.

Yes you can get any branch you like in jorhart engineering college or Assam engineering college.
As the merit marks for general is 139-381.
The previous year cutoff for Assam college was 130 and for jorhart it was 120.
It may increase this year so you can get an admission.
There is high chances for you to get an admission. You should apply for the college for counseling and get a branch of your choice.
All the best!