You can get admission in only the National Law Universities through CLAT. Rest all the law colleges in the country have their own procedure of selection.
And it would not be correct to say that getting admission in any a college other than giving CLAT would not be worth it. As only the top tier NLUs have great facilities, faculty, placements and exposure. Rest of the NLUs are still working upon it. Whereas there a many colleges in India which are better than the middle and the lower tier NLUs like GLC Mumbai, ILS Pune, Symbiosis Law School, Jindal Global Law School and many other government/private law colleges in Delhi, Mumbai, Pune, Bangalore, Chandigarh and other cities and states.

So, it is NOT compulsory to take CLAT to pursue      BBA LLB or or any other law course.
There are many other entrances for admission into the colleges other than NLUs. And There are various law colleges better in all aspects than lower/middle NLUs, so it absolutely worth taking admission in law colleges except through CLAT.