Colleges in Dehradun

It is not good. You can consider BFIT and DBS.

Birla Institute is a good college for studies. But, in terms of placement DIT is a better option.

DIT is a good college rather than BIT for CSE.

Yes, you can easily get admission in Uttarakhand for lateral entry. There is an exam conducted every year by Uttarakhand Technical University. The name of the exam is UKSEE. After that, there will be counselling. Moreover, after that some seats may remain vacant.

No college is good in Dehradun for MBA. You can take admission in Chandigarh University. Its placement is higher as CU also has tie ups with foreign colleges. Recently, one of my friend's sisters got placed with a good package in TATA from MBA department. Many more companies visited this year in CU.

By taking admission in this college you can get only pool campus. Nowadays, JBIT-Dehradun and Tula's Institute are the best colleges as they have low fee structure as compared to the other colleges.
The best colleges for CSE are Graphic era and DIT, Dehradun but they may have a high fee structure.

ICFAI is the best option for you. UPES is only good for petroleum engineering.

BFIT is one of the best colleges in India to pursue B.Sc in forestry.

The Uttarakhand Technical University is one of best universities nowadays and Tulas placement of 2016/17 was good for CSE, IT & Electronics branch. Lots of software companies visited this year. Tulas also provided lots of pool campus this year. Placement depends on your ability because every year in Uttarakhand lots of pool campus takes place.
As from the point of view of education, COER is considered as best college in UTU as I too studied in COER, but placement is not so good.
In terms of placement, Graphic Era is the best university but its fee structure is very high.
DIT, Dehradun is also a good college.