If anybody is concerned about GRAMMAR in VA,
"Better English" by Norman Lewis fits the bill perfectly.
Cost: around 100 Rs. , available in all leading bookstores
Why I recommend it-
1. No regular theory
2. Concentrates on most frequent usage errors, the kind of thing CAT tests u on.
3. Easy to read, very simple to understand
4. Lots of exercises!
With increasing ambiguity in VA

, Grammar looks the lesser ambiguious of all parts*
*in my personal opinion
