TTP really made a difference in my GRE prep. Although I was initially apprehensive of spending on yet another GRE prep material, the 5-day trial was enough to convince me about TTP's quality as an investment. Concept are explained in a very clear and structured way from first principles (especially quant concepts). Once I managed to build a consistent schedule for practicing with the material, it was easy to track my progress. I would use the error log to understand my mistakes and narrowed down on such areas of weakness for more practice. I managed to boost my score significantly using TTP, recording a 320 after two months of practice. Hands down TTP is the best and I highly recommend it to all.