I'm not sure how to describe Sachin other than saying he was an okay teacher. But, considering almost every other Calc teacher there is, that might not be half that bad. First of all, the first day of class was full with more than 100 students. The last day of class only had 17, of 51 that hadn't dropped out. Throughout most of the semester, only about a third of the class ever bothered to show up. The general consensus was that he was a bit confusing, and I myself often left the class not sure of what was going on. Many thought the lectures weren't even necessary because ***he posts all of his notes online***.
However, I've heard horror stories of other people's Calc teachers, and on second thought, Sachin is actually quite a decent professor. He held office hours constantly, and was quite available outside of class. He could have been better on this front and regarding e-mails, but all-in-all he made the effort to explain further if necessary. He was a really nice guy and, though a bit awkward, approachable and willing to help. He somehow managed to learn the names of most of the students (even those who didn't go to class often), which I think demonstrates his effort and is always a nice touch.
Sachin was encouraging after the first midterm (when more than half the class dropped out) and promised our grades would not be affected as much if we did better in the second midterm. He made sure that we knew the material (though most were too scared to confess we actually didn't), and he ***spoke English relatively well*** (other than a weird way of pronouncing "h", he was fairly understandable, though I'd recommend sitting close up front... he tends to speak a bit low).
Most importantly, he was VERY FLEXIBLE in his grading. He made clear from the start that the median grade would be curved up to a B+ at the end of the class. Moreover, at the end of each test, he'd always add anywhere from 5 to 10 *extra* points, apparently in a merciful act of boosting our grades (I had originally gotten a 60% on the first midterm, but he added about an extra two points to each exercise, so I got a 70%). Indeed, the median and average grades were always in the high 50's to mid-60's, but you could tell he was lenient enough to boost our grades in the end. After the second midterm, he gave an optional, BONUS quiz (that could therefore only *improve* our grade). Not sure how that would work out given the curve (median grade in the class gets a B+), but nevertheless it was nice and proved he cared about our grades.
He graded everything *very* quickly (final was corrected in a day, the midterms in about a week each), and was very responsible with our homeworks. The homeworks, though, were REALLY long and annoying and stressful. Many times the homeworks had exercises that were nearly impossible to solve/ not discussed at all; I would be lying if I said I didn't rely HEAVILY on Cramster and Woolfram Alpha to get good grades in them (he grades each, dropping the lowest grade out of 11 homeworks). Most of the times they involved reaching/demonstrating some formula using calculus (eg. proving the formula giving the volume of a cone using integrals and a bunch of variables, etc.).
In the end, I'm not sure I can recommend any one way to study for the class. I mostly just dedicated two entire nights to doing the weekly homeworks, and then looking over all my notes, homeworks, the book, the study guide and previous tests to study. In the end, you're mostly just stuck with relying on the curve to get a good grade. A's and B's are definitely possible without the curve, but I wouldn't stress out too much after each test, the median is always in the 50's and 60's. Surprisingly, there weren't any mega-geniuses around to ruin the curve or anything.
So, to sum up, Sachin is not a stellar teacher, but he gets the job done and makes Calculus I (which is usually not the most exciting topic, especially for math teachers used to more complicated things) as bearable as possible. He's not the best teacher around, but he's certainly not the worst, and I can say with fair certainty that you don't need to run away from his class at all. Given all the other teachers in the Math Department, I'd say he's a pretty good, safe choice.