Choosing between B.Tech entrance exam and direct admission completely depends on your requirement. If you are not sure of securing admission in a top B.Tech college and branch with your entrance exam rank or score, it is advisable to go for direct admission.
However, direct admission in B.Tech is possible only in private colleges or deemed universities. You can’t get direct admission into government engineering colleges as the admissions in these colleges are based on the rules and regulations fixed by the state government. One has to appear for an entrance exam/ participate in the counselling process to get admission into a government engineering college. The seats are allocated on the basis of merit, i.e., the performance of candidates in the entrance exam or class 12 th marks.
There is a term called "Management Quota" where the students pay extra fees for admission in the college. Some of the BBA Colleges in India are offering Direct BBA Admission without Entrance Test, which is through Management Quota. You can ask the college for directly for admission.
Hope this helps!