With learning Physics, I found for me going forwards and backwards on every page was an amazing help (this method was the only way I could get decent grades when I was learning physics at Polytechnic of NYU), but eventually this method got me bogged down. I try nowadays to combine several methods of learning. One way is to listen to lectures by experts that are now accessible on the internet. In years past, there was no access to anything like this unless one was enrolled in a university. I also hold strongly with the path of learning of Rav Nachman of saying the words and going on with no review until I have finished the whole book, and then review the whole book at least four times. {This comes from the Conversations of Rav Nachman of Breslov number 76. It is also hinted at in the LeM of Rav Nachman vol. I, chapter 11. } In the great litvak yeshivot, it is accepted that everyone needs slow painstaking learning in the morning and fast learning in the afternoon. Iyun in morning. Bekiut in afternoon. The way i did iyun in Shar Yashuv and the Mirer Yeshiva was mainly by review of the Maharsha and Pnei Yehoshua about ten times for each paragraph.