Another site:
AllTop 200 most popular tests to learn English...
1) Test de niveau anglais (webmaster) 6 784 884
2) Placement test : grammar for beginners (anonyme) 6 003 951
3) A/AN (webmaster) 5 372 499
4) Auxiliary BE (webmaster) 3 227 770
5) Present continuous (webmaster) 3 004 015
6) Present simple (webmaster) 2 927 996
7) Present simple (webmaster) 2 601 804
8) Present continuous (webmaster) 2 442 120
9) Adjectives (webmaster) 2 095 817
10) A/an (anonyme) 2 019 533
11) Present perfect simple (webmaster) 1 651 783
12) Preterite (webmaster) 1 638 434
13) Vocabulary - Placement test (bridg) 1 621 254
14) Preterite (webmaster) 1 453 880
15) Short placement test (webmaster) 1 445 355
16) To be (bridg) 1 408 563
17) Present perfect (webmaster) 1 353 029
18) What time is it? (webmaster) 1 351 570
19) The alphabet in English (webmaster) 1 323 210
20) Adjectives (anonyme) 1 218 141
21) What time is it? (webmaster) 1 212 270
22) Numbers (webmaster) 1 189 848
23) 'A' ou 'An' (anonyme) 1 178 613
24) Two presents: present continuous, present simple (webmaster) 1 152 140
25) To be (bridg) 1 147 458
26) Comparatives / Superlatives (webmaster) 1 111 737
27) Numbers (webmaster) 1 072 766
28) CAN / MUST (webmaster) 1 060 191
29) THE/ A / AN / nothing (webmaster) 1 037 051
30) Comparatives (webmaster) 1 008 702
31) Family life (bridg) 1 002 668
32) Numbers > 100 (webmaster) 987 811
33) Future (going to/will/present continuous) (anonyme) 967 147
34) Plural (webmaster) 957 472
35) Superlatives (webmaster) 876 875
36) Adjectives (anonyme) 876 371
37) Simple present (bridg) 855 888
38) Spelled words N°1 (bridg) 851 828
39) Placement test beginners: Check your spelling (anonyme) 831 029
40) Introducing oneself (webmaster) 828 243
41) Adverbs of frequency (anonyme) 819 983
42) Family (bridg) 786 237
43) Present simple (anonyme) 784 400
44) General test-End of high school / Beginning of university (webmaster) 784 302
45) Frequency adverbs (webmaster) 779 134
46) Present BE + Ving (bridg) 767 459
47) Passive form (anonyme) 733 384
48) Genitive (webmaster) 724 743
49) Family tree (anonyme) 720 667
50) Preterite: simple or continuous? (webmaster) 718 857
51) Placement test (beginners) (lili73) 703 113
52) Past simple or present perfect (anonyme) 698 207
53) Future (webmaster) 676 959
54) Present perfect simple (bridg) 665 673
55) 2 Preterites (webmaster) 664 314
56) Preterite (webmaster) 623 195
57) List of 200 irregular verbs and audio (bridg) 617 916
58) Modals (webmaster) 613 711
59) Spelled words N°2 (bridg) 610 461
60) Modals (webmaster) 609 012
61) Height (webmaster) 607 156
62) Articles a / an / the (anonyme) 596 783
63) Plural forms (bridg) 578 979
64) Nationalities (webmaster) 575 354
65) Past continuous / Past simple (anonyme) 570 475
66) Irregular plurals (bridg) 555 000
67) Two presents: simple and continuous (webmaster) 550 779
68) Preterite (bridg) 550 431
69) Superlatives (frapedur) 542 943
70) Vocabulary: greeting people (here4u) 536 614
71) Give your opinion (bridg) 533 157
72) Adverbs of Frequency (bridg) 518 001
73) Present simple or continuous (anonyme) 513 988
74) Present perfect / preterite ? (anonyme) 513 254
75) Possessive case (anonyme) 481 629
76) Countries & nationalities (bridg) 474 655
77) Past tenses (bridg) 472 561
78) 'The' or nothing? (webmaster) 472 009
79) Introducing oneself (easy) (webmaster) 471 454
80) Passive voice (webmaster) 465 351
81) Present Simple vs. Past Simple (anonyme) 461 065
82) Questions : how to ask them (anonyme) 449 334
83) General Test II / End of high school / Beginning of universi (webmaster) 447 044
84) IN, ON, AT or TO? (webmaster) 446 720
85) Relative pronouns (webmaster) 446 464
86) Comparative of superiority (anonyme) 441 018
87) How to pronounce the final -ED? (past simple) (webmaster) 439 860
88) Relative clauses (webmaster) 424 401
89) Sounds: [h] (webmaster) 420 133
90) Comparative (anonyme) 415 662
91) Past simple (anonyme) 401 501
92) A/an/Ø (bridg) 399 980
93) Future simple (anonyme) 398 042
94) This / That / These / Those (webmaster) 393 327
95) Conditional (webmaster) 392 992
96) Passive voice (anonyme) 392 139
97) Comparing (webmaster) 388 707
98) Can / could/ may/ might (woodyrun) 381 000
99) Present perfect or past tense (anonyme) 379 565
100) Much, many, little and few (felin) 375 187
101) Personal pronouns (anonyme) 371 761
102) Preterite continuous (BE + -ING) (webmaster) 371 432
103) Genitive case (bridg) 369 188
104) Some, any, no, enough, too/too much/too many (webmaster) 368 816
105) Confusing words - Placement test (bridg) 365 030
106) Irregular verbs (webmaster) 364 744
107) Numbers from 1 to 10 (anonyme) 362 158
108) Past perfect simple, past perfect continuous (anonyme) 361 314
109) Present continuous or present simple (webmaster) 360 215
110) Present perfect or preterite? (anonyme) 359 393
111) Simple Past : regular verbs (anonyme) 355 211
112) Comparative Adjectives (bridg) 352 839
113) Who, Whom, Which, or Whose? (anonyme) 350 098
114) Past simple (video) (anonyme) 349 734
115) Past simple or past continuous (anonyme) 346 130
116) While / When (anonyme) 341 187
117) What time is it? (webmaster) 338 817
118) Modals (tinou) 337 321
119) Modal: may/might (anonyme) 334 835
120) Cardinal and ordinal numbers (anonyme) 329 379
121) The superlative (anonyme) 328 014
122) Possessive adjectives and pronouns (woodyrun) 325 097
123) How to talk about the weather (lili73) 320 983
124) Since and for (anonyme) 320 001
125) Flags (webmaster) 318 206
126) Irregular verbs (bridg) 316 855
127) Pronouns (woodyrun) 315 632
128) Prepositions - in, on, at (anonyme) 314 645
129) Tenses (anonyme) 313 186
130) Placement test 3 (webmaster) 311 038
131) Order of adjectives (webmaster) 307 190
132) Could/Couldn't (laure95) 306 858
133) Comparative (anonyme) 305 438
134) Adjectives and prepositions (anonyme) 304 626
135) Agreement Tags (webmaster) 304 609
136) Asking questions (webmaster) 303 759
137) Present perfect OR simple past? (bridg) 298 933
138) Questions in the past tense (anonyme) 298 638
139) Uncountable nouns (webmaster) 296 639
140) Superlative Adjectives (bridg) 296 572
141) Object pronouns (bridg) 296 417
142) Passive form (anonyme) 294 494
143) Placement test 1 (anonyme) 293 504
144) Present simple (anonyme) 292 315
145) Can/Must/Should (laure95) 291 765
146) Past perfect (lili73) 291 179
147) Prefer/rather (bridg) 290 246
148) Must or Have to? (woodyrun) 288 757
149) The/an/nothing (bridg) 285 944
150) To be (anonyme) 283 676
151) Can and can't (laure95) 283 291
152) Vocabulary: asking and answering (here4u) 280 505
153) Modal verbs (bridg) 277 762
154) Some / Any / no... (bridg) 275 330
155) Days of the week (bridg) 269 230
156) So / neither (anonyme) 264 655
157) Past simple (video) (anonyme) 264 250
158) Present continuous (chnawa) 262 464
159) Used to (bridg) 260 627
160) Should / must (anonyme) 260 542
161) Past tense (anonyme) 259 843
162) Articles : a / an / the / Ø (anonyme) 258 897
163) Vocabulary: on the phone (here4u) 258 861
164) Find out a quantity (webmaster) 258 805
165) Superlative + and adjective (anonyme) 257 953
166) Comparative and superlative (anonyme) 257 685
167) Numbers 1/100 (anonyme) 254 049
168) Modal can (video) (anonyme) 253 474
169) Comparatives (anonyme) 251 684
170) Relatives pronouns (who, which, that...) (anonyme) 247 901
171) A few, a little, few, little (anonyme) 246 518
172) Vocabulary: at the restaurant (here4u) 245 718
173) Would rather / would prefer to (anonyme) 245 023
174) Present continuous and the Going to form (anonyme) 243 351
175) Should/ have to/ must (anonyme) 241 341
176) Have something done (anonyme) 240 186
177) Used to/would (woodyrun) 238 485
178) The past (webmaster) 238 077
179) Future continuous and future perfect. (felin) 238 077
180) How to ask a question in English (bridg) 236 312
181) Pluperfect (webmaster) 234 597
182) I wish, if only (felin) 234 457
183) Some / any (younes91) 234 381
184) Countable or Uncountable? (webmaster) 233 963
185) Should / shouldn't (anonyme) 232 179
186) Present simple or continuous (bridg) 230 840
187) Adjectives - ing and ed (felin) 229 753
188) Hypothesis (webmaster) 228 772
189) Must or mustn't (laure95) 227 152
190) Auxiliary BE (anonyme) 226 686
191) Articles a/an/the/0 (bridg) 226 490
192) Article The or nothing (anonyme) 226 361
193) Present perfect with Ever - never - (anonyme) 226 222
194) Present continuous OR Present simple? (bridg) 225 808
195) Simple Preterite OR Preterite (BE+ing) (webmaster) 223 203
196) Comparison (komiks) 221 614
197) To / in order to / so as to / so that (irish21) 221 287
198) Present perfect (bridg) 219 868
199) Indirect speech (bridg) 218 168
200) What time is it ? (anonyme) 217 977
