Absolutely Not! I took Grading and drainage, twice! Still waiting for results of my second attempt. Don't feel confident about this one either. I used LARE Preps study guide and have about 85% of the material memorized. LARE Prep's practice exams are more expensive but I feel they resemble the actual LARE exams at a more accurate level. You also get to take the exams an endless amount of times, within the 3 months of purchase. There are two versions to purchase.
CLARBs practice exams are a joke. I took it the first time and received a score of 85% and yet I failed my first real exam and don't feel confident about my second attempt. CLARB's practice exam difficult level does not accurately portray the real exams. It's like they took the easiest questions they retired and put them in the practice exam. You also only get to take the practice exam 3 times.
Ultimately, neither practice exam is going to be a spot on resemblance to legit exams but in my opinion the LARE Prep deserves your money. And if you're wondering I failed my first real exam attempt by a few questions.