Maybe you should use all of that free time of yours to look at some CS theory then :)
https://www.amazon.co.uk/Graph-Theory-Graduate-Texts-Mathematics/dp/3642142788
https://www.amazon.co.uk/Introduction-Theory-Computation-International-Michael/dp/1133187811/ref=sr_1_1?s=books&ie=UTF8&qid=1494931134&sr=1-1&keywords=sipser+theory+of+computation
https://www.amazon.co.uk/Computational-Complexity-Approach-Sanjeev-Arora/dp/0521424267/ref=sr_1_2?s=books&ie=UTF8&qid=1494931159&sr=1-2&keywords=computational+complexity